diff --git a/Sources/CliTool/Subcommands/SessionCommand.swift b/Sources/CliTool/Subcommands/SessionCommand.swift
index ff53948..9cf7019 100644
--- a/Sources/CliTool/Subcommands/SessionCommand.swift
+++ b/Sources/CliTool/Subcommands/SessionCommand.swift
@@ -220,7 +220,7 @@ extension Subcommands {
                         print("Submit \(candidate.text)")
                         converter.setCompletedData(candidate)
                         converter.updateLearningData(candidate)
-                        composingText.prefixComplete(correspondingCount: candidate.correspondingCount)
+                        composingText.prefixComplete(composingCount: candidate.composingCount)
                         if composingText.isEmpty {
                             composingText.stopComposition()
                             converter.stopComposition()
diff --git a/Sources/KanaKanjiConverterModule/ConversionAlgorithms/Core/FullInputProcessing.swift b/Sources/KanaKanjiConverterModule/ConversionAlgorithms/Core/FullInputProcessing.swift
index a213d03..86a0770 100644
--- a/Sources/KanaKanjiConverterModule/ConversionAlgorithms/Core/FullInputProcessing.swift
+++ b/Sources/KanaKanjiConverterModule/ConversionAlgorithms/Core/FullInputProcessing.swift
@@ -28,11 +28,16 @@ extension Kana2Kanji {
     /// (4)ノードをアップデートした上で返却する。
     func kana2lattice_all(_ inputData: ComposingText, N_best: Int, needTypoCorrection: Bool) -> (result: LatticeNode, lattice: Lattice) {
         debug("新規に計算を行います。inputされた文字列は\(inputData.input.count)文字分の\(inputData.convertTarget)")
-        let count: Int = inputData.input.count
+        let inputCount: Int = inputData.input.count
+        let surfaceCount = inputData.convertTarget.count
         let result: LatticeNode = LatticeNode.EOSNode
-        let lattice: Lattice = Lattice(nodes: (.zero ..< count).map {dicdataStore.getLOUDSDataInRange(inputData: inputData, from: $0, needTypoCorrection: needTypoCorrection)})
+        let lattice: Lattice = Lattice(
+            inputCount: inputCount,
+            surfaceCount: surfaceCount,
+            rawNodes: (.zero ..< inputCount).map {dicdataStore.getLOUDSDataInRange(inputData: inputData, from: $0, needTypoCorrection: needTypoCorrection)}
+        )
         // 「i文字目から始まるnodes」に対して
-        for (i, nodeArray) in lattice.enumerated() {
+        for (i, nodeArray) in lattice.indexedNodes() {
             // それぞれのnodeに対して
             for node in nodeArray {
                 if node.prevs.isEmpty {
@@ -43,7 +48,7 @@ extension Kana2Kanji {
                 }
                 // 生起確率を取得する。
                 let wValue: PValue = node.data.value()
-                if i == 0 {
+                if i.isZero {
                     // valuesを更新する
                     node.values = node.prevs.map {$0.totalValue + wValue + self.dicdataStore.getCCValue($0.data.rcid, node.data.lcid)}
                 } else {
@@ -51,12 +56,12 @@ extension Kana2Kanji {
                     node.values = node.prevs.map {$0.totalValue + wValue}
                 }
                 // 変換した文字数
-                let nextIndex: Int = node.inputRange.endIndex
+                let nextIndex = node.range.endIndex
                 // 文字数がcountと等しい場合登録する
-                if nextIndex == count {
+                if nextIndex == .input(inputCount) || nextIndex == .surface(surfaceCount) {
                     self.updateResultNode(with: node, resultNode: result)
                 } else {
-                    self.updateNextNodes(with: node, nextNodes: lattice[inputIndex: nextIndex], nBest: N_best)
+                    self.updateNextNodes(with: node, nextNodes: lattice[index: nextIndex], nBest: N_best)
                 }
             }
         }
diff --git a/Sources/KanaKanjiConverterModule/ConversionAlgorithms/Core/FullInputProcessingWithPrefixConstraint.swift b/Sources/KanaKanjiConverterModule/ConversionAlgorithms/Core/FullInputProcessingWithPrefixConstraint.swift
index 5a6a35a..7cf89b5 100644
--- a/Sources/KanaKanjiConverterModule/ConversionAlgorithms/Core/FullInputProcessingWithPrefixConstraint.swift
+++ b/Sources/KanaKanjiConverterModule/ConversionAlgorithms/Core/FullInputProcessingWithPrefixConstraint.swift
@@ -20,11 +20,16 @@ extension Kana2Kanji {
     /// (4)ノードをアップデートした上で返却する。
     func kana2lattice_all_with_prefix_constraint(_ inputData: ComposingText, N_best: Int, constraint: PrefixConstraint) -> (result: LatticeNode, lattice: Lattice) {
         debug("新規に計算を行います。inputされた文字列は\(inputData.input.count)文字分の\(inputData.convertTarget)。制約は\(constraint)")
-        let count: Int = inputData.input.count
+        let inputCount: Int = inputData.input.count
+        let surfaceCount: Int = inputData.convertTarget.count
         let result: LatticeNode = LatticeNode.EOSNode
-        let lattice: Lattice = Lattice(nodes: (.zero ..< count).map {dicdataStore.getLOUDSDataInRange(inputData: inputData, from: $0, needTypoCorrection: false)})
+        let lattice: Lattice = Lattice(
+            inputCount: inputCount,
+            surfaceCount: surfaceCount,
+            rawNodes: (.zero ..< inputCount).map {dicdataStore.getLOUDSDataInRange(inputData: inputData, from: $0, needTypoCorrection: false)}
+        )
         // 「i文字目から始まるnodes」に対して
-        for (i, nodeArray) in lattice.enumerated() {
+        for (i, nodeArray) in lattice.indexedNodes() {
             // それぞれのnodeに対して
             for node in nodeArray {
                 if node.prevs.isEmpty {
@@ -32,7 +37,7 @@ extension Kana2Kanji {
                 }
                 // 生起確率を取得する。
                 let wValue: PValue = node.data.value()
-                if i == 0 {
+                if i.isZero {
                     // valuesを更新する
                     node.values = node.prevs.map {$0.totalValue + wValue + self.dicdataStore.getCCValue($0.data.rcid, node.data.lcid)}
                 } else {
@@ -40,9 +45,9 @@ extension Kana2Kanji {
                     node.values = node.prevs.map {$0.totalValue + wValue}
                 }
                 // 変換した文字数
-                let nextIndex: Int = node.inputRange.endIndex
+                let nextIndex = node.range.endIndex
                 // 文字数がcountと等しい場合登録する
-                if nextIndex == count {
+                if nextIndex == .input(inputCount) || nextIndex == .surface(surfaceCount) {
                     for index in node.prevs.indices {
                         let newnode: RegisteredNode = node.getRegisteredNode(index, value: node.values[index])
                         // 学習データやユーザ辞書由来の場合は素通しする
@@ -61,7 +66,7 @@ extension Kana2Kanji {
                         Array(($0.data.reduce(into: "") { $0.append(contentsOf: $1.word)} + node.data.word).utf8)
                     }
                     // nodeの繋がる次にあり得る全てのnextnodeに対して
-                    for nextnode in lattice[inputIndex: nextIndex] {
+                    for nextnode in lattice[index: nextIndex] {
                         // クラスの連続確率を計算する。
                         let ccValue: PValue = self.dicdataStore.getCCValue(node.data.rcid, nextnode.data.lcid)
                         // nodeの持っている全てのprevnodeに対して
diff --git a/Sources/KanaKanjiConverterModule/ConversionAlgorithms/Core/PredictionProcessing.swift b/Sources/KanaKanjiConverterModule/ConversionAlgorithms/Core/PredictionProcessing.swift
index 06b1fa3..3278d59 100644
--- a/Sources/KanaKanjiConverterModule/ConversionAlgorithms/Core/PredictionProcessing.swift
+++ b/Sources/KanaKanjiConverterModule/ConversionAlgorithms/Core/PredictionProcessing.swift
@@ -14,7 +14,7 @@ extension Kana2Kanji {
             return Candidate(
                 text: left.text + right.text,
                 value: left.value + right.value,
-                correspondingCount: left.correspondingCount + right.correspondingCount,
+                composingCount: .composite(left.composingCount, right.composingCount),
                 lastMid: right.lastMid,
                 data: left.data + right.data
             )
@@ -26,7 +26,7 @@ extension Kana2Kanji {
         return Candidate(
             text: left.text + right.text,
             value: newValue,
-            correspondingCount: left.correspondingCount + right.correspondingCount,
+            composingCount: .composite(left.composingCount, right.composingCount),
             lastMid: right.lastMid,
             data: left.data + right.data
         )
@@ -57,7 +57,7 @@ extension Kana2Kanji {
                 prefixCandidate.data = prefixCandidateData
 
                 prefixCandidate.text = prefixCandidateData.reduce(into: "") { $0 += $1.word }
-                prefixCandidate.correspondingCount = prefixCandidateData.reduce(into: 0) { $0 += $1.ruby.count }
+                prefixCandidate.composingCount = .surfaceCount(prefixCandidateData.reduce(into: 0) { $0 += $1.ruby.count })
             }
 
             totalWord.insert(contentsOf: element.word, at: totalWord.startIndex)
diff --git a/Sources/KanaKanjiConverterModule/ConversionAlgorithms/Core/PrefixCompletionProcessing.swift b/Sources/KanaKanjiConverterModule/ConversionAlgorithms/Core/PrefixCompletionProcessing.swift
index 16a4aad..5a1f6ba 100644
--- a/Sources/KanaKanjiConverterModule/ConversionAlgorithms/Core/PrefixCompletionProcessing.swift
+++ b/Sources/KanaKanjiConverterModule/ConversionAlgorithms/Core/PrefixCompletionProcessing.swift
@@ -17,29 +17,30 @@ extension Kana2Kanji {
     /// (2)次に、再度計算して良い候補を得る。
     func kana2lattice_afterComplete(_ inputData: ComposingText, completedData: Candidate, N_best: Int, previousResult: (inputData: ComposingText, lattice: Lattice), needTypoCorrection: Bool) -> (result: LatticeNode, lattice: Lattice) {
         debug("確定直後の変換、前は：", previousResult.inputData, "後は：", inputData)
-        let count = inputData.input.count
+        let inputCount = inputData.input.count
+        let surfaceCount = inputData.convertTarget.count
+        // TODO: 実際にはもっとチェックが必要。具体的には、input/convertTarget両方のsuffixが一致する必要がある
+        let convertedInputCount = previousResult.inputData.input.count - inputCount
+        let convertedSurfaceCount = previousResult.inputData.convertTarget.count - surfaceCount
         // (1)
         let start = RegisteredNode.fromLastCandidate(completedData)
-        let lattice = previousResult.lattice.suffix(count)
-        for (i, nodeArray) in lattice.enumerated() {
-            if i == .zero {
-                for node in nodeArray {
-                    node.prevs = [start]
-                    // inputRangeを確定した部分のカウント分ずらす
-                    node.inputRange = node.inputRange.startIndex - completedData.correspondingCount ..< node.inputRange.endIndex - completedData.correspondingCount
-                }
+        let lattice = previousResult.lattice.suffix(inputCount: inputCount, surfaceCount: surfaceCount)
+        for (i, nodeArray) in lattice.indexedNodes() {
+            let prevs: [RegisteredNode] = if i.isZero {
+                [start]
             } else {
-                for node in nodeArray {
-                    node.prevs = []
-                    // inputRangeを確定した部分のカウント分ずらす
-                    node.inputRange = node.inputRange.startIndex - completedData.correspondingCount ..< node.inputRange.endIndex - completedData.correspondingCount
-                }
+                []
+            }
+            for node in nodeArray {
+                node.prevs = prevs
+                // inputRangeを確定した部分のカウント分ずらす
+                node.range = node.range.offseted(inputOffset: -convertedInputCount, surfaceOffset: -convertedSurfaceCount)
             }
         }
         // (2)
         let result = LatticeNode.EOSNode
 
-        for (i, nodeArray) in lattice.enumerated() {
+        for (i, nodeArray) in lattice.indexedNodes() {
             for node in nodeArray {
                 if node.prevs.isEmpty {
                     continue
@@ -49,7 +50,7 @@ extension Kana2Kanji {
                 }
                 // 生起確率を取得する。
                 let wValue = node.data.value()
-                if i == 0 {
+                if i.isZero {
                     // valuesを更新する
                     node.values = node.prevs.map {$0.totalValue + wValue + self.dicdataStore.getCCValue($0.data.rcid, node.data.lcid)}
                 } else {
@@ -57,11 +58,11 @@ extension Kana2Kanji {
                     node.values = node.prevs.map {$0.totalValue + wValue}
                 }
                 // 変換した文字数
-                let nextIndex = node.inputRange.endIndex
-                if nextIndex != count {
-                    self.updateNextNodes(with: node, nextNodes: lattice[inputIndex: nextIndex], nBest: N_best)
-                } else {
+                let nextIndex = node.range.endIndex
+                if nextIndex == .input(inputCount) || nextIndex == .surface(surfaceCount) {
                     self.updateResultNode(with: node, resultNode: result)
+                } else {
+                    self.updateNextNodes(with: node, nextNodes: lattice[index: nextIndex], nBest: N_best)
                 }
             }
 
diff --git a/Sources/KanaKanjiConverterModule/ConversionAlgorithms/Core/SuffixReplacementProcessing.swift b/Sources/KanaKanjiConverterModule/ConversionAlgorithms/Core/SuffixReplacementProcessing.swift
index 2634a20..187a045 100644
--- a/Sources/KanaKanjiConverterModule/ConversionAlgorithms/Core/SuffixReplacementProcessing.swift
+++ b/Sources/KanaKanjiConverterModule/ConversionAlgorithms/Core/SuffixReplacementProcessing.swift
@@ -6,6 +6,7 @@
 //  Copyright © 2020 ensan. All rights reserved.
 //
 
+import Algorithms
 import Foundation
 import SwiftUtils
 
@@ -24,27 +25,43 @@ extension Kana2Kanji {
     ///
     /// (5)ノードをアップデートした上で返却する。
 
-    func kana2lattice_changed(_ inputData: ComposingText, N_best: Int, counts: (deleted: Int, added: Int), previousResult: (inputData: ComposingText, lattice: Lattice), needTypoCorrection: Bool) -> (result: LatticeNode, lattice: Lattice) {
+    func kana2lattice_changed(
+        _ inputData: ComposingText,
+        N_best: Int,
+        counts: (deletedInput: Int, addedInput: Int, deletedSurface: Int, addedSurface: Int),
+        previousResult: (inputData: ComposingText, lattice: Lattice),
+        needTypoCorrection: Bool
+    ) -> (result: LatticeNode, lattice: Lattice) {
         // (0)
-        let count = inputData.input.count
-        let commonCount = previousResult.inputData.input.count - counts.deleted
-        debug("kana2lattice_changed", inputData, counts, previousResult.inputData, count, commonCount)
+        let inputCount = inputData.input.count
+        let surfaceCount = inputData.convertTarget.count
+        let commonInputCount = previousResult.inputData.input.count - counts.deletedInput
+        let commonSurfaceCount = previousResult.inputData.convertTarget.count - counts.deletedSurface
+        debug("kana2lattice_changed", inputData, counts, previousResult.inputData, inputCount, commonInputCount)
 
         // (1)
-        var lattice = previousResult.lattice.prefix(commonCount)
+        var lattice = previousResult.lattice.prefix(inputCount: commonInputCount, surfaceCount: commonSurfaceCount)
 
         let terminalNodes: Lattice
-        if counts.added == 0 {
-            terminalNodes = Lattice(nodes: lattice.map {
-                $0.filter {
-                    $0.inputRange.endIndex == count
+        if counts.addedInput == 0 {
+            terminalNodes = Lattice(
+                inputCount: inputCount,
+                surfaceCount: surfaceCount,
+                rawNodes: lattice.map {
+                    $0.filter {
+                        $0.range.endIndex == .input(inputCount) || $0.range.endIndex == .surface(inputCount)
+                    }
                 }
-            })
+            )
         } else {
             // (2)
-            let addedNodes: Lattice = Lattice(nodes: (0..<count).map {(i: Int) in
-                self.dicdataStore.getLOUDSDataInRange(inputData: inputData, from: i, toIndexRange: max(commonCount, i) ..< count, needTypoCorrection: needTypoCorrection)
-            })
+            let addedNodes: Lattice = Lattice(
+                inputCount: inputCount,
+                surfaceCount: surfaceCount,
+                rawNodes: (0..<inputCount).map {(i: Int) in
+                    self.dicdataStore.getLOUDSDataInRange(inputData: inputData, from: i, toIndexRange: max(commonInputCount, i) ..< inputCount, needTypoCorrection: needTypoCorrection)
+                }
+            )
 
             // (3)
             for nodeArray in lattice {
@@ -56,8 +73,8 @@ extension Kana2Kanji {
                         continue
                     }
                     // 変換した文字数
-                    let nextIndex = node.inputRange.endIndex
-                    self.updateNextNodes(with: node, nextNodes: addedNodes[inputIndex: nextIndex], nBest: N_best)
+                    let nextIndex = node.range.endIndex
+                    self.updateNextNodes(with: node, nextNodes: addedNodes[index: nextIndex], nBest: N_best)
                 }
             }
             lattice.merge(addedNodes)
@@ -86,11 +103,11 @@ extension Kana2Kanji {
                     // valuesを更新する
                     node.values = node.prevs.map {$0.totalValue + wValue}
                 }
-                let nextIndex = node.inputRange.endIndex
-                if count == nextIndex {
+                let nextIndex = node.range.endIndex
+                if nextIndex == .input(inputCount) || nextIndex == .surface(surfaceCount) {
                     self.updateResultNode(with: node, resultNode: result)
                 } else {
-                    self.updateNextNodes(with: node, nextNodes: terminalNodes[inputIndex: nextIndex], nBest: N_best)
+                    self.updateNextNodes(with: node, nextNodes: terminalNodes[index: nextIndex], nBest: N_best)
                 }
             }
         }
diff --git a/Sources/KanaKanjiConverterModule/ConversionAlgorithms/Core/UnchangedInputProcessing.swift b/Sources/KanaKanjiConverterModule/ConversionAlgorithms/Core/UnchangedInputProcessing.swift
index 443d37b..72d9473 100644
--- a/Sources/KanaKanjiConverterModule/ConversionAlgorithms/Core/UnchangedInputProcessing.swift
+++ b/Sources/KanaKanjiConverterModule/ConversionAlgorithms/Core/UnchangedInputProcessing.swift
@@ -6,6 +6,7 @@
 //  Copyright © 2022 ensan. All rights reserved.
 //
 
+import Algorithms
 import Foundation
 import SwiftUtils
 
@@ -26,12 +27,13 @@ extension Kana2Kanji {
 
     func kana2lattice_no_change(N_best: Int, previousResult: (inputData: ComposingText, lattice: Lattice)) -> (result: LatticeNode, lattice: Lattice) {
         debug("キャッシュから復元、元の文字は：", previousResult.inputData.convertTarget)
-        let count = previousResult.inputData.input.count
+        let inputCount = previousResult.inputData.input.count
+        let surfaceCount = previousResult.inputData.convertTarget.count
         // (1)
         let result = LatticeNode.EOSNode
 
         for nodeArray in previousResult.lattice {
-            for node in nodeArray where node.inputRange.endIndex == count {
+            for node in nodeArray where node.range.endIndex == .input(inputCount) || node.range.endIndex == .surface(surfaceCount) {
                 if node.prevs.isEmpty {
                     continue
                 }
diff --git a/Sources/KanaKanjiConverterModule/ConversionAlgorithms/Kana2Kanji.swift b/Sources/KanaKanjiConverterModule/ConversionAlgorithms/Kana2Kanji.swift
index cd3c9c3..5080734 100644
--- a/Sources/KanaKanjiConverterModule/ConversionAlgorithms/Kana2Kanji.swift
+++ b/Sources/KanaKanjiConverterModule/ConversionAlgorithms/Kana2Kanji.swift
@@ -34,11 +34,14 @@ struct Kana2Kanji {
         let text = data.clauses.map {$0.clause.text}.joined()
         let value = data.clauses.last!.value + mmValue.value
         let lastMid = data.clauses.last!.clause.mid
-        let correspondingCount = data.clauses.reduce(into: 0) {$0 += $1.clause.inputRange.count}
+
+        let composingCount: ComposingCount = data.clauses.reduce(into: .inputCount(0)) {
+            $0 = .composite($0, $1.clause.range.count)
+        }
         return Candidate(
             text: text,
             value: value,
-            correspondingCount: correspondingCount,
+            composingCount: composingCount,
             lastMid: lastMid,
             data: data.data
         )
diff --git a/Sources/KanaKanjiConverterModule/ConversionAlgorithms/Lattice.swift b/Sources/KanaKanjiConverterModule/ConversionAlgorithms/Lattice.swift
index e451b34..3370e59 100644
--- a/Sources/KanaKanjiConverterModule/ConversionAlgorithms/Lattice.swift
+++ b/Sources/KanaKanjiConverterModule/ConversionAlgorithms/Lattice.swift
@@ -1,49 +1,180 @@
+import Algorithms
+import SwiftUtils
+
 struct Lattice: Sequence {
     typealias Element = [LatticeNode]
-    typealias Iterator = IndexingIterator<[[LatticeNode]]>
 
-    init(nodes: [[LatticeNode]] = []) {
-        self.nodes = nodes
+    init() {
+        self.inputIndexedNodes = []
+        self.surfaceIndexedNodes = []
     }
 
-    private var nodes: [[LatticeNode]]
+    init(inputCount: Int, surfaceCount: Int, rawNodes: [[LatticeNode]]) {
+        self.inputIndexedNodes = .init(repeating: [], count: inputCount)
+        self.surfaceIndexedNodes = .init(repeating: [], count: surfaceCount)
 
-    func prefix(_ k: Int) -> Lattice {
-        var lattice = Lattice(nodes: self.nodes.prefix(k).map {(nodes: [LatticeNode]) in
-            nodes.filter {$0.inputRange.endIndex <= k}
-        })
-        while lattice.nodes.last?.isEmpty ?? false {
-            lattice.nodes.removeLast()
+        for nodes in rawNodes {
+            guard let first = nodes.first else { continue }
+            switch first.range.startIndex {
+            case .surface(let i):
+                self.surfaceIndexedNodes[i] = nodes
+            case .input(let i):
+                self.inputIndexedNodes[i] = nodes
+            }
         }
-        return lattice
     }
 
-    func suffix(_ count: Int) -> Lattice {
-        Lattice(nodes: self.nodes.suffix(count))
+    private init(inputIndexedNodes: [[LatticeNode]], surfaceIndexedNodes: [[LatticeNode]]) {
+        self.inputIndexedNodes = inputIndexedNodes
+        self.surfaceIndexedNodes = surfaceIndexedNodes
+    }
+
+    private var inputIndexedNodes: [[LatticeNode]]
+    private var surfaceIndexedNodes: [[LatticeNode]]
+
+    func prefix(inputCount: Int, surfaceCount: Int) -> Lattice {
+        let filterClosure: (LatticeNode) -> Bool = { (node: LatticeNode) -> Bool in
+            switch node.range.endIndex {
+            case .input(let value):
+                value <= inputCount
+            case .surface(let value):
+                value <= surfaceCount
+            }
+        }
+        let newInputIndexedNodes = Array(self.inputIndexedNodes.prefix(inputCount).map {(nodes: [LatticeNode]) in
+            nodes.filter(filterClosure)
+        }.drop(while: \.isEmpty))
+        let newSurfaceIndexedNodes = Array(self.surfaceIndexedNodes.prefix(surfaceCount).map {(nodes: [LatticeNode]) in
+            nodes.filter(filterClosure)
+        }.drop(while: \.isEmpty))
+
+        return Lattice(inputIndexedNodes: newInputIndexedNodes, surfaceIndexedNodes: newSurfaceIndexedNodes)
+    }
+
+    func suffix(inputCount: Int, surfaceCount: Int) -> Lattice {
+        Lattice(
+            inputIndexedNodes: self.inputIndexedNodes.suffix(inputCount),
+            surfaceIndexedNodes: self.surfaceIndexedNodes.suffix(surfaceCount)
+        )
     }
 
     mutating func merge(_ lattice: Lattice) {
-        for (index, nodeArray) in lattice.nodes.enumerated() where index < self.nodes.endIndex {
-            self.nodes[index].append(contentsOf: nodeArray)
+        for (index, nodeArray) in lattice.inputIndexedNodes.enumerated() where index < self.inputIndexedNodes.endIndex {
+            self.inputIndexedNodes[index].append(contentsOf: nodeArray)
         }
-        if self.nodes.endIndex < lattice.nodes.endIndex {
-            for nodeArray in lattice.nodes[self.nodes.endIndex...] {
-                self.nodes.append(nodeArray)
+        if self.inputIndexedNodes.endIndex < lattice.inputIndexedNodes.endIndex {
+            for nodeArray in lattice.inputIndexedNodes[self.inputIndexedNodes.endIndex...] {
+                self.inputIndexedNodes.append(nodeArray)
+            }
+        }
+        for (index, nodeArray) in lattice.surfaceIndexedNodes.enumerated() where index < self.surfaceIndexedNodes.endIndex {
+            self.surfaceIndexedNodes[index].append(contentsOf: nodeArray)
+        }
+        if self.surfaceIndexedNodes.endIndex < lattice.surfaceIndexedNodes.endIndex {
+            for nodeArray in lattice.surfaceIndexedNodes[self.surfaceIndexedNodes.endIndex...] {
+                self.surfaceIndexedNodes.append(nodeArray)
             }
         }
     }
 
     subscript(inputIndex i: Int) -> [LatticeNode] {
         get {
-            self.nodes[i]
+            self.inputIndexedNodes[i]
         }
     }
 
-    func makeIterator() -> IndexingIterator<[[LatticeNode]]> {
-        self.nodes.makeIterator()
+    subscript(index index: LatticeIndex) -> [LatticeNode] {
+        get {
+            switch index {
+            case .input(let i): self.inputIndexedNodes[i]
+            case .surface(let i): self.surfaceIndexedNodes[i]
+            }
+        }
+    }
+
+    func indexedNodes() -> some Sequence<(index: LatticeIndex, nodes: [LatticeNode])> {
+        self.inputIndexedNodes.enumerated().lazy.map { (.input($0.offset), $0.element) }
+            .chained(self.surfaceIndexedNodes.enumerated().lazy.map { (.surface($0.offset), $0.element) })
+    }
+
+    func makeIterator() -> Chain2Sequence<[[LatticeNode]], [[LatticeNode]]>.Iterator {
+        self.inputIndexedNodes.chained(self.surfaceIndexedNodes).makeIterator()
     }
 
     var isEmpty: Bool {
-        self.nodes.isEmpty
+        self.inputIndexedNodes.isEmpty && self.surfaceIndexedNodes.isEmpty
+    }
+
+    enum LatticeIndex: Sendable, Equatable {
+        case surface(Int)
+        case input(Int)
+
+        var isZero: Bool {
+            self == .surface(0) || self == .input(0)
+        }
+    }
+
+    enum LatticeRange: Sendable, Equatable {
+        static var zero: Self {
+            .input(from: 0, to: 0)
+        }
+        case surface(from: Int, to: Int)
+        case input(from: Int, to: Int)
+
+        var count: ComposingCount {
+            switch self {
+            case .surface(let from, let to):
+                .surfaceCount(to - from)
+            case .input(let from, let to):
+                .inputCount(to - from)
+            }
+        }
+
+        var startIndex: LatticeIndex {
+            switch self {
+            case .surface(let from, _):
+                .surface(from)
+            case .input(let from, _):
+                .input(from)
+            }
+        }
+
+        var endIndex: LatticeIndex {
+            switch self {
+            case .surface(_, let to):
+                .surface(to)
+            case .input(_, let to):
+                .input(to)
+            }
+        }
+
+        func merged(with other: Self) -> Self? {
+            switch (self, other) {
+            case (let .surface(l, ml), let .surface(mr, r)):
+                if ml == mr {
+                    .surface(from: l, to: r)
+                } else {
+                    nil
+                }
+            case (let .input(l, ml), let .input(mr, r)):
+                if ml == mr {
+                    .input(from: l, to: r)
+                } else {
+                    nil
+                }
+            case (.surface, .input), (.input, .surface):
+                nil
+            }
+        }
+
+        func offseted(inputOffset: Int, surfaceOffset: Int) -> Self {
+            switch self {
+            case .surface(from: let from, to: let to):
+                .surface(from: from + surfaceOffset, to: to + surfaceOffset)
+            case .input(from: let from, to: let to):
+                .input(from: from + inputOffset, to: to + inputOffset)
+            }
+        }
+
     }
 }
diff --git a/Sources/KanaKanjiConverterModule/ConversionAlgorithms/LatticeNode.swift b/Sources/KanaKanjiConverterModule/ConversionAlgorithms/LatticeNode.swift
index 92d33ab..e18cb3c 100644
--- a/Sources/KanaKanjiConverterModule/ConversionAlgorithms/LatticeNode.swift
+++ b/Sources/KanaKanjiConverterModule/ConversionAlgorithms/LatticeNode.swift
@@ -17,23 +17,23 @@ public final class LatticeNode {
     /// `prevs`の各要素に対応するスコアのデータ
     var values: [PValue] = []
     /// inputData.input内のrange
-    var inputRange: Range<Int>
+    var range: Lattice.LatticeRange
 
     /// `EOS`に対応するノード。
     static var EOSNode: LatticeNode {
-        LatticeNode(data: DicdataElement.EOSData, inputRange: 0..<0)
+        LatticeNode(data: DicdataElement.EOSData, range: .zero)
     }
 
-    init(data: DicdataElement, inputRange: Range<Int>) {
+    init(data: DicdataElement, range: Lattice.LatticeRange) {
         self.data = data
         self.values = [data.value()]
-        self.inputRange = inputRange
+        self.range = range
     }
 
     /// `LatticeNode`の持っている情報を反映した`RegisteredNode`を作成する
     /// `LatticeNode`は複数の過去のノードを持つことができるが、`RegisteredNode`は1つしか持たない。
     func getRegisteredNode(_ index: Int, value: PValue) -> RegisteredNode {
-        RegisteredNode(data: self.data, registered: self.prevs[index], totalValue: value, inputRange: self.inputRange)
+        RegisteredNode(data: self.data, registered: self.prevs[index], totalValue: value, range: self.range)
     }
 
     /// 再帰的にノードを遡り、`CandidateData`を構築する関数
diff --git a/Sources/KanaKanjiConverterModule/ConversionAlgorithms/PostCompositionPredictionCandidate.swift b/Sources/KanaKanjiConverterModule/ConversionAlgorithms/PostCompositionPredictionCandidate.swift
index 5649b45..29a73bb 100644
--- a/Sources/KanaKanjiConverterModule/ConversionAlgorithms/PostCompositionPredictionCandidate.swift
+++ b/Sources/KanaKanjiConverterModule/ConversionAlgorithms/PostCompositionPredictionCandidate.swift
@@ -36,7 +36,7 @@ public struct PostCompositionPredictionCandidate {
                 candidate.data.append(data)
             }
             candidate.value = self.value
-            candidate.correspondingCount = candidate.data.reduce(into: 0) { $0 += $1.ruby.count }
+            candidate.composingCount = .surfaceCount(candidate.rubyCount)
             candidate.lastMid = data.last(where: DicdataStore.includeMMValueCalculation)?.mid ?? candidate.lastMid
             return candidate
         case .replacement(let targetData, let replacementData):
@@ -45,7 +45,7 @@ public struct PostCompositionPredictionCandidate {
             candidate.text = candidate.data.reduce(into: "") {$0 += $1.word}
             candidate.value = self.value
             candidate.lastMid = candidate.data.last(where: DicdataStore.includeMMValueCalculation)?.mid ?? MIDData.BOS.mid
-            candidate.correspondingCount = candidate.data.reduce(into: 0) { $0 += $1.ruby.count }
+            candidate.composingCount = .surfaceCount(candidate.rubyCount)
             return candidate
         }
     }
diff --git a/Sources/KanaKanjiConverterModule/ConversionAlgorithms/Prediction.swift b/Sources/KanaKanjiConverterModule/ConversionAlgorithms/Prediction.swift
index 31d3e9b..1cde0ac 100644
--- a/Sources/KanaKanjiConverterModule/ConversionAlgorithms/Prediction.swift
+++ b/Sources/KanaKanjiConverterModule/ConversionAlgorithms/Prediction.swift
@@ -22,9 +22,14 @@ extension Kana2Kanji {
     /// - note:
     ///     この関数の役割は意味連接の考慮にある。
     func getPredictionCandidates(composingText: ComposingText, prepart: CandidateData, lastClause: ClauseDataUnit, N_best: Int) -> [Candidate] {
-        debug("getPredictionCandidates", composingText, lastClause.inputRange, lastClause.text)
-        let lastRuby = ComposingText.getConvertTarget(for: composingText.input[lastClause.inputRange]).toKatakana()
-        let lastRubyCount = lastClause.inputRange.count
+        debug("getPredictionCandidates", composingText, lastClause.range, lastClause.text)
+        let lastRuby = switch lastClause.range {
+        case let .input(left, right):
+            ComposingText.getConvertTarget(for: composingText.input[left..<right]).toKatakana()
+        case let .surface(left, right):
+            String(composingText.convertTarget.dropFirst(left).prefix(right - left))
+        }
+        let lastRubyCount = lastRuby.count
         let datas: [DicdataElement]
         do {
             var _str = ""
@@ -42,11 +47,11 @@ extension Kana2Kanji {
 
         let osuserdict: [DicdataElement] = dicdataStore.getPrefixMatchDynamicUserDict(lastRuby)
 
-        let lastCandidate: Candidate = prepart.isEmpty ? Candidate(text: "", value: .zero, correspondingCount: 0, lastMid: MIDData.EOS.mid, data: []) : self.processClauseCandidate(prepart)
+        let lastCandidate: Candidate = prepart.isEmpty ? Candidate(text: "", value: .zero, composingCount: .inputCount(0), lastMid: MIDData.EOS.mid, data: []) : self.processClauseCandidate(prepart)
         let lastRcid: Int = lastCandidate.data.last?.rcid ?? CIDData.EOS.cid
         let nextLcid: Int = prepart.lastClause?.nextLcid ?? CIDData.EOS.cid
         let lastMid: Int = lastCandidate.lastMid
-        let correspoindingCount: Int = lastCandidate.correspondingCount + lastRubyCount
+        let composingCount: ComposingCount = .composite(lastCandidate.composingCount, .surfaceCount(lastRubyCount))
         let ignoreCCValue: PValue = self.dicdataStore.getCCValue(lastRcid, nextLcid)
 
         let inputStyle = composingText.input.last?.inputStyle ?? .direct
@@ -91,7 +96,7 @@ extension Kana2Kanji {
             let candidate: Candidate = Candidate(
                 text: lastCandidate.text + data.word,
                 value: newValue,
-                correspondingCount: correspoindingCount,
+                composingCount: composingCount,
                 lastMid: includeMMValueCalculation ? data.mid:lastMid,
                 data: nodedata
             )
diff --git a/Sources/KanaKanjiConverterModule/ConversionAlgorithms/RegisteredNodeProtocol.swift b/Sources/KanaKanjiConverterModule/ConversionAlgorithms/RegisteredNodeProtocol.swift
index 1afdcfc..fa16bf5 100644
--- a/Sources/KanaKanjiConverterModule/ConversionAlgorithms/RegisteredNodeProtocol.swift
+++ b/Sources/KanaKanjiConverterModule/ConversionAlgorithms/RegisteredNodeProtocol.swift
@@ -14,7 +14,7 @@ protocol RegisteredNodeProtocol {
     var data: DicdataElement {get}
     var prev: (any RegisteredNodeProtocol)? {get}
     var totalValue: PValue {get}
-    var inputRange: Range<Int> {get}
+    var range: Lattice.LatticeRange {get}
 }
 
 struct RegisteredNode: RegisteredNodeProtocol {
@@ -25,19 +25,19 @@ struct RegisteredNode: RegisteredNodeProtocol {
     /// 始点からこのノードまでのコスト
     let totalValue: PValue
     /// `composingText`の`input`で対応する範囲
-    let inputRange: Range<Int>
+    let range: Lattice.LatticeRange
 
-    init(data: DicdataElement, registered: RegisteredNode?, totalValue: PValue, inputRange: Range<Int>) {
+    init(data: DicdataElement, registered: RegisteredNode?, totalValue: PValue, range: Lattice.LatticeRange) {
         self.data = data
         self.prev = registered
         self.totalValue = totalValue
-        self.inputRange = inputRange
+        self.range = range
     }
 
     /// 始点ノードを生成する関数
     /// - Returns: 始点ノードのデータ
     static func BOSNode() -> RegisteredNode {
-        RegisteredNode(data: DicdataElement.BOSData, registered: nil, totalValue: 0, inputRange: 0 ..< 0)
+        RegisteredNode(data: DicdataElement.BOSData, registered: nil, totalValue: 0, range: .zero)
     }
 
     /// 入力中、確定した部分を考慮した始点ノードを生成する関数
@@ -47,7 +47,7 @@ struct RegisteredNode: RegisteredNodeProtocol {
             data: DicdataElement(word: "", ruby: "", lcid: CIDData.BOS.cid, rcid: candidate.data.last?.rcid ?? CIDData.BOS.cid, mid: candidate.lastMid, value: 0),
             registered: nil,
             totalValue: 0,
-            inputRange: 0 ..< 0
+            range: .zero
         )
     }
 }
@@ -59,7 +59,7 @@ extension RegisteredNodeProtocol {
         guard let prev else {
             let unit = ClauseDataUnit()
             unit.mid = self.data.mid
-            unit.inputRange = self.inputRange
+            unit.range = self.range
             return CandidateData(clauses: [(clause: unit, value: .zero)], data: [])
         }
         var lastcandidate = prev.getCandidateData()    // 自分に至るregisterdそれぞれのデータに処理
@@ -75,7 +75,11 @@ extension RegisteredNodeProtocol {
         if lastClause.text.isEmpty || !DicdataStore.isClause(prev.data.rcid, self.data.lcid) {
             // 文節ではないので、最後に追加する。
             lastClause.text.append(self.data.word)
-            lastClause.inputRange = lastClause.inputRange.startIndex ..< self.inputRange.endIndex
+            if let newRange = lastClause.range.merged(with: self.range) {
+                lastClause.range = newRange
+            } else {
+                fatalError("このケースは想定していません。")
+            }
             // 最初だった場合を想定している
             if (lastClause.mid == 500 && self.data.mid != 500) || DicdataStore.includeMMValueCalculation(self.data) {
                 lastClause.mid = self.data.mid
@@ -88,7 +92,7 @@ extension RegisteredNodeProtocol {
         else {
             let unit = ClauseDataUnit()
             unit.text = self.data.word
-            unit.inputRange = self.inputRange
+            unit.range = self.range
             if DicdataStore.includeMMValueCalculation(self.data) {
                 unit.mid = self.data.mid
             }
diff --git a/Sources/KanaKanjiConverterModule/ConversionAlgorithms/Zenzai/zenzai.swift b/Sources/KanaKanjiConverterModule/ConversionAlgorithms/Zenzai/zenzai.swift
index f253be8..5cd2a19 100644
--- a/Sources/KanaKanjiConverterModule/ConversionAlgorithms/Zenzai/zenzai.swift
+++ b/Sources/KanaKanjiConverterModule/ConversionAlgorithms/Zenzai/zenzai.swift
@@ -65,7 +65,7 @@ extension Kana2Kanji {
         var constraint = zenzaiCache?.getNewConstraint(for: inputData) ?? PrefixConstraint([])
         debug("initial constraint", constraint)
         let eosNode = LatticeNode.EOSNode
-        var lattice: Lattice = Lattice(nodes: [])
+        var lattice: Lattice = Lattice()
         var constructedCandidates: [(RegisteredNode, Candidate)] = []
         var insertedCandidates: [(RegisteredNode, Candidate)] = []
         defer {
diff --git a/Sources/KanaKanjiConverterModule/ConverterAPI/Candidate.swift b/Sources/KanaKanjiConverterModule/ConverterAPI/Candidate.swift
index e62bd7f..8489880 100644
--- a/Sources/KanaKanjiConverterModule/ConverterAPI/Candidate.swift
+++ b/Sources/KanaKanjiConverterModule/ConverterAPI/Candidate.swift
@@ -17,28 +17,32 @@ final class ClauseDataUnit {
     /// The text of the unit.
     var text: String = ""
     /// The range of the unit in input text.
-    var inputRange: Range<Int> = 0 ..< 0
+    var range: Lattice.LatticeRange = .zero
 
     /// Merge the given unit to this unit.
     /// - Parameter:
     ///   - unit: The unit to merge.
     func merge(with unit: ClauseDataUnit) {
         self.text.append(unit.text)
-        self.inputRange = self.inputRange.startIndex ..< unit.inputRange.endIndex
+        if let newRange =  self.range.merged(with: unit.range) {
+            self.range = newRange
+        } else {
+            fatalError("このケースは想定していません。")
+        }
         self.nextLcid = unit.nextLcid
     }
 }
 
 extension ClauseDataUnit: Equatable {
     static func == (lhs: ClauseDataUnit, rhs: ClauseDataUnit) -> Bool {
-        lhs.mid == rhs.mid && lhs.nextLcid == rhs.nextLcid && lhs.text == rhs.text && lhs.inputRange == rhs.inputRange
+        lhs.mid == rhs.mid && lhs.nextLcid == rhs.nextLcid && lhs.text == rhs.text && lhs.range == rhs.range
     }
 }
 
 #if DEBUG
 extension ClauseDataUnit: CustomDebugStringConvertible {
     var debugDescription: String {
-        "ClauseDataUnit(mid: \(mid), nextLcid: \(nextLcid), text: \(text), inputRange: \(inputRange))"
+        "ClauseDataUnit(mid: \(mid), nextLcid: \(nextLcid), text: \(text), range: \(range))"
     }
 }
 #endif
@@ -67,14 +71,24 @@ public enum CompleteAction: Equatable, Sendable {
     case moveCursor(Int)
 }
 
+public enum ComposingCount: Equatable, Sendable {
+    /// composingText.inputにおいて対応する文字数。
+    case inputCount(Int)
+    /// composingText.convertTargeにおいて対応する文字数。
+    case surfaceCount(Int)
+
+    /// 複数のカウントの連結
+    indirect case composite(Self, Self)
+}
+
 /// 変換候補のデータ
 public struct Candidate: Sendable {
     /// 入力となるテキスト
     public var text: String
     /// 評価値
     public var value: PValue
-    /// composingText.inputにおいて対応する文字数。
-    public var correspondingCount: Int
+
+    public var composingCount: ComposingCount
     /// 最後のmid(予測変換に利用)
     public var lastMid: Int
     /// DicdataElement列
@@ -86,14 +100,18 @@ public struct Candidate: Sendable {
     /// - note: 文字数表示のために追加したフラグ
     public let inputable: Bool
 
-    public init(text: String, value: PValue, correspondingCount: Int, lastMid: Int, data: [DicdataElement], actions: [CompleteAction] = [], inputable: Bool = true) {
+    /// ルビ文字数
+    public let rubyCount: Int
+
+    public init(text: String, value: PValue, composingCount: ComposingCount, lastMid: Int, data: [DicdataElement], actions: [CompleteAction] = [], inputable: Bool = true) {
         self.text = text
         self.value = value
-        self.correspondingCount = correspondingCount
+        self.composingCount = composingCount
         self.lastMid = lastMid
         self.data = data
         self.actions = actions
         self.inputable = inputable
+        self.rubyCount = self.data.reduce(into: 0) { $0 += $1.ruby.count }
     }
     /// 後から`action`を追加した形を生成する関数
     /// - parameters:
@@ -138,7 +156,7 @@ public struct Candidate: Sendable {
     /// 入力を文としたとき、prefixになる文節に対応するCandidateを作る
     public static func makePrefixClauseCandidate(data: some Collection<DicdataElement>) -> Candidate {
         var text = ""
-        var correspondingCount = 0
+        var composingCount = 0
         var lastRcid = CIDData.BOS.cid
         var lastMid = 501
         var candidateData: [DicdataElement] = []
@@ -148,7 +166,7 @@ public struct Candidate: Sendable {
                 break
             }
             text.append(item.word)
-            correspondingCount += item.ruby.count
+            composingCount += item.ruby.count
             lastRcid = item.rcid
             // 最初だった場合を想定している
             if item.mid != 500 && DicdataStore.includeMMValueCalculation(item) {
@@ -159,7 +177,7 @@ public struct Candidate: Sendable {
         return Candidate(
             text: text,
             value: -5,
-            correspondingCount: correspondingCount,
+            composingCount: .surfaceCount(composingCount),
             lastMid: lastMid,
             data: candidateData
         )
diff --git a/Sources/KanaKanjiConverterModule/ConverterAPI/KanaKanjiConverter.swift b/Sources/KanaKanjiConverterModule/ConverterAPI/KanaKanjiConverter.swift
index 17e7dda..ff0a2b2 100644
--- a/Sources/KanaKanjiConverterModule/ConverterAPI/KanaKanjiConverter.swift
+++ b/Sources/KanaKanjiConverterModule/ConverterAPI/KanaKanjiConverter.swift
@@ -168,7 +168,7 @@ import EfficientNGram
         var textIndex = [String: Int]()
         for candidate in candidates where !candidate.text.isEmpty && !seenCandidates.contains(candidate.text) {
             if let index = textIndex[candidate.text] {
-                if result[index].value < candidate.value || result[index].correspondingCount < candidate.correspondingCount {
+                if result[index].value < candidate.value || result[index].rubyCount < candidate.rubyCount {
                     result[index] = candidate
                 }
             } else {
@@ -219,7 +219,7 @@ import EfficientNGram
                     let candidate: Candidate = Candidate(
                         text: ruby,
                         value: penalty,
-                        correspondingCount: inputData.input.count,
+                        composingCount: .inputCount(inputData.input.count),
                         lastMid: MIDData.一般.mid,
                         data: data
                     )
@@ -232,7 +232,7 @@ import EfficientNGram
                     let candidate: Candidate = Candidate(
                         text: word,
                         value: value,
-                        correspondingCount: inputData.input.count,
+                        composingCount: .inputCount(inputData.input.count),
                         lastMid: MIDData.一般.mid,
                         data: data
                     )
@@ -251,7 +251,7 @@ import EfficientNGram
                     let candidate: Candidate = Candidate(
                         text: ruby,
                         value: penalty,
-                        correspondingCount: inputData.input.count,
+                        composingCount: .inputCount(inputData.input.count),
                         lastMid: MIDData.一般.mid,
                         data: data
                     )
@@ -264,7 +264,7 @@ import EfficientNGram
                     let candidate: Candidate = Candidate(
                         text: word,
                         value: value,
-                        correspondingCount: inputData.input.count,
+                        composingCount: .inputCount(inputData.input.count),
                         lastMid: MIDData.一般.mid,
                         data: data
                     )
@@ -368,7 +368,7 @@ import EfficientNGram
     private func getAdditionalCandidate(_ inputData: ComposingText, options: ConvertRequestOptions) -> [Candidate] {
         var candidates: [Candidate] = []
         let string = inputData.convertTarget.toKatakana()
-        let correspondingCount = inputData.input.count
+        let composingCount: ComposingCount = .inputCount(inputData.input.count)
         do {
             // カタカナ
             let value = -14 * getKatakanaScore(string)
@@ -376,7 +376,7 @@ import EfficientNGram
             let katakana = Candidate(
                 text: string,
                 value: value,
-                correspondingCount: correspondingCount,
+                composingCount: composingCount,
                 lastMid: MIDData.一般.mid,
                 data: [data]
             )
@@ -390,7 +390,7 @@ import EfficientNGram
             let hiragana = Candidate(
                 text: hiraganaString,
                 value: -14.5,
-                correspondingCount: correspondingCount,
+                composingCount: composingCount,
                 lastMid: MIDData.一般.mid,
                 data: [data]
             )
@@ -403,7 +403,7 @@ import EfficientNGram
             let uppercasedLetter = Candidate(
                 text: word,
                 value: -14.6,
-                correspondingCount: correspondingCount,
+                composingCount: composingCount,
                 lastMid: MIDData.一般.mid,
                 data: [data]
             )
@@ -416,7 +416,7 @@ import EfficientNGram
             let fullWidthLetter = Candidate(
                 text: word,
                 value: -14.7,
-                correspondingCount: correspondingCount,
+                composingCount: composingCount,
                 lastMid: MIDData.一般.mid,
                 data: [data]
             )
@@ -429,7 +429,7 @@ import EfficientNGram
             let halfWidthKatakana = Candidate(
                 text: word,
                 value: -15,
-                correspondingCount: correspondingCount,
+                composingCount: composingCount,
                 lastMid: MIDData.一般.mid,
                 data: [data]
             )
@@ -472,7 +472,7 @@ import EfficientNGram
             return Candidate(
                 text: first.clause.text,
                 value: first.value,
-                correspondingCount: first.clause.inputRange.count,
+                composingCount: first.clause.range.count,
                 lastMid: first.clause.mid,
                 data: Array(candidateData.data[0...count])
             )
@@ -529,10 +529,10 @@ import EfficientNGram
         var seenCandidate: Set<String> = full_candidate.mapSet {$0.text}
         // 文節のみ変換するパターン（上位5件）
         let clause_candidates = self.getUniqueCandidate(clauseCandidates, seenCandidates: seenCandidate).min(count: 5) {
-            if $0.correspondingCount == $1.correspondingCount {
+            if $0.rubyCount == $1.rubyCount {
                 $0.value > $1.value
             } else {
-                $0.correspondingCount > $1.correspondingCount
+                $0.rubyCount > $1.rubyCount
             }
         }
         seenCandidate.formUnion(clause_candidates.map {$0.text})
@@ -543,7 +543,7 @@ import EfficientNGram
                 Candidate(
                     text: $0.data.word,
                     value: $0.data.value(),
-                    correspondingCount: $0.inputRange.count,
+                    composingCount: $0.range.count,
                     lastMid: $0.data.mid,
                     data: [$0.data]
                 )
@@ -554,8 +554,8 @@ import EfficientNGram
         // 文字列の長さごとに並べ、かつその中で評価の高いものから順に並べる。
         var word_candidates: [Candidate] = self.getUniqueCandidate(dicCandidates.chained(additionalCandidates), seenCandidates: seenCandidate)
             .sorted {
-                let count0 = $0.correspondingCount
-                let count1 = $1.correspondingCount
+                let count0 = $0.rubyCount
+                let count1 = $1.rubyCount
                 return count0 == count1 ? $0.value > $1.value : count0 > count1
             }
         seenCandidate.formUnion(word_candidates.map {$0.text})
@@ -590,10 +590,10 @@ import EfficientNGram
         }
         // 文節のみ変換するパターン（上位5件）
         let firstClauseResults = self.getUniqueCandidate(clauseCandidates).min(count: 5) {
-            if $0.correspondingCount == $1.correspondingCount {
+            if $0.rubyCount == $1.rubyCount {
                 $0.value > $1.value
             } else {
-                $0.correspondingCount > $1.correspondingCount
+                $0.rubyCount > $1.rubyCount
             }
         }
         return ConversionResult(mainResults: result, firstClauseResults: firstClauseResults)
@@ -662,7 +662,7 @@ import EfficientNGram
         let diff = inputData.differenceSuffix(to: previousInputData)
 
         debug("\(#function): 最後尾文字置換用の関数を呼びます、差分は\(diff)")
-        let result = converter.kana2lattice_changed(inputData, N_best: N_best, counts: (diff.deleted, diff.addedCount), previousResult: (inputData: previousInputData, lattice: self.lattice), needTypoCorrection: needTypoCorrection)
+        let result = converter.kana2lattice_changed(inputData, N_best: N_best, counts: diff, previousResult: (inputData: previousInputData, lattice: self.lattice), needTypoCorrection: needTypoCorrection)
         self.previousInputData = inputData
         return result
     }
diff --git a/Sources/KanaKanjiConverterModule/ConverterAPI/SpecialConversion/CalendarCandidate.swift b/Sources/KanaKanjiConverterModule/ConverterAPI/SpecialConversion/CalendarCandidate.swift
index dbe3af4..8a983a1 100644
--- a/Sources/KanaKanjiConverterModule/ConverterAPI/SpecialConversion/CalendarCandidate.swift
+++ b/Sources/KanaKanjiConverterModule/ConverterAPI/SpecialConversion/CalendarCandidate.swift
@@ -21,7 +21,7 @@ extension KanaKanjiConverter {
         return result.map {[Candidate(
             text: $0,
             value: -15,
-            correspondingCount: inputData.input.count,
+            composingCount: .inputCount(inputData.input.count),
             lastMid: MIDData.一般.mid,
             data: [DicdataElement(word: $0, ruby: string, cid: CIDData.固有名詞.cid, mid: MIDData.一般.mid, value: -15)]
         )]} ?? []
@@ -116,7 +116,7 @@ extension KanaKanjiConverter {
             Candidate(
                 text: $0,
                 value: -18,
-                correspondingCount: inputData.input.count,
+                composingCount: .inputCount(inputData.input.count),
                 lastMid: MIDData.年.mid,
                 data: [DicdataElement(word: $0, ruby: string, cid: CIDData.一般名詞.cid, mid: MIDData.年.mid, value: -18)]
             )
@@ -125,7 +125,7 @@ extension KanaKanjiConverter {
             Candidate(
                 text: $0,
                 value: -19,
-                correspondingCount: inputData.input.count,
+                composingCount: .inputCount(inputData.input.count),
                 lastMid: MIDData.年.mid,
                 data: [DicdataElement(word: $0, ruby: string, cid: CIDData.一般名詞.cid, mid: MIDData.年.mid, value: -19)]
             )
diff --git a/Sources/KanaKanjiConverterModule/ConverterAPI/SpecialConversion/CommaSeparatedNumber.swift b/Sources/KanaKanjiConverterModule/ConverterAPI/SpecialConversion/CommaSeparatedNumber.swift
index 23c910c..52d1f58 100644
--- a/Sources/KanaKanjiConverterModule/ConverterAPI/SpecialConversion/CommaSeparatedNumber.swift
+++ b/Sources/KanaKanjiConverterModule/ConverterAPI/SpecialConversion/CommaSeparatedNumber.swift
@@ -38,7 +38,7 @@ extension KanaKanjiConverter {
         let candidate = Candidate(
             text: result,
             value: -10,
-            correspondingCount: inputData.input.count,
+            composingCount: .inputCount(inputData.input.count),
             lastMid: MIDData.一般.mid,
             data: [DicdataElement(word: result, ruby: ruby, cid: CIDData.固有名詞.cid, mid: MIDData.一般.mid, value: -10)]
         )
diff --git a/Sources/KanaKanjiConverterModule/ConverterAPI/SpecialConversion/EmailAddress.swift b/Sources/KanaKanjiConverterModule/ConverterAPI/SpecialConversion/EmailAddress.swift
index a883ac9..84124a2 100644
--- a/Sources/KanaKanjiConverterModule/ConverterAPI/SpecialConversion/EmailAddress.swift
+++ b/Sources/KanaKanjiConverterModule/ConverterAPI/SpecialConversion/EmailAddress.swift
@@ -46,7 +46,7 @@ extension KanaKanjiConverter {
                     Candidate(
                         text: address,
                         value: baseValue - PValue(i),
-                        correspondingCount: inputData.input.count,
+                        composingCount: .inputCount(inputData.input.count),
                         lastMid: MIDData.一般.mid,
                         data: [DicdataElement(word: address, ruby: string, cid: .zero, mid: MIDData.一般.mid, value: baseValue - PValue(i))]
                     )
diff --git a/Sources/KanaKanjiConverterModule/ConverterAPI/SpecialConversion/RomanTypographys.swift b/Sources/KanaKanjiConverterModule/ConverterAPI/SpecialConversion/RomanTypographys.swift
index 8733c37..1e8b331 100644
--- a/Sources/KanaKanjiConverterModule/ConverterAPI/SpecialConversion/RomanTypographys.swift
+++ b/Sources/KanaKanjiConverterModule/ConverterAPI/SpecialConversion/RomanTypographys.swift
@@ -37,7 +37,7 @@ extension KanaKanjiConverter {
             Candidate(
                 text: $0,
                 value: -15,
-                correspondingCount: inputData.input.count,
+                composingCount: .inputCount(inputData.input.count),
                 lastMid: MIDData.一般.mid,
                 data: [DicdataElement(word: $0, ruby: string, cid: CIDData.固有名詞.cid, mid: MIDData.一般.mid, value: -15)]
             )
diff --git a/Sources/KanaKanjiConverterModule/ConverterAPI/SpecialConversion/TimeExpression.swift b/Sources/KanaKanjiConverterModule/ConverterAPI/SpecialConversion/TimeExpression.swift
index 630f7cf..ca21766 100644
--- a/Sources/KanaKanjiConverterModule/ConverterAPI/SpecialConversion/TimeExpression.swift
+++ b/Sources/KanaKanjiConverterModule/ConverterAPI/SpecialConversion/TimeExpression.swift
@@ -17,7 +17,7 @@ extension KanaKanjiConverter {
                 let candidate = Candidate(
                     text: timeExpression,
                     value: -10,
-                    correspondingCount: numberString.count,
+                    composingCount: .surfaceCount(numberString.count),
                     lastMid: MIDData.一般.mid,
                     data: [DicdataElement(word: timeExpression, ruby: numberString, cid: CIDData.固有名詞.cid, mid: MIDData.一般.mid, value: -10)]
                 )
@@ -31,7 +31,7 @@ extension KanaKanjiConverter {
                 let candidate = Candidate(
                     text: timeExpression,
                     value: -10,
-                    correspondingCount: numberString.count,
+                    composingCount: .surfaceCount(numberString.count),
                     lastMid: MIDData.一般.mid,
                     data: [DicdataElement(word: timeExpression, ruby: numberString, cid: CIDData.固有名詞.cid, mid: MIDData.一般.mid, value: -10)]
                 )
diff --git a/Sources/KanaKanjiConverterModule/ConverterAPI/SpecialConversion/Unicode.swift b/Sources/KanaKanjiConverterModule/ConverterAPI/SpecialConversion/Unicode.swift
index 79e1475..e1461cb 100644
--- a/Sources/KanaKanjiConverterModule/ConverterAPI/SpecialConversion/Unicode.swift
+++ b/Sources/KanaKanjiConverterModule/ConverterAPI/SpecialConversion/Unicode.swift
@@ -22,7 +22,7 @@ extension KanaKanjiConverter {
                     Candidate(
                         text: char,
                         value: value0,
-                        correspondingCount: inputData.input.count,
+                        composingCount: .inputCount(inputData.input.count),
                         lastMid: MIDData.一般.mid,
                         data: [DicdataElement(word: char, ruby: string, cid: .zero, mid: MIDData.一般.mid, value: value0)]
                     )
diff --git a/Sources/KanaKanjiConverterModule/ConverterAPI/SpecialConversion/VersionCandidate.swift b/Sources/KanaKanjiConverterModule/ConverterAPI/SpecialConversion/VersionCandidate.swift
index 6a55962..c069144 100644
--- a/Sources/KanaKanjiConverterModule/ConverterAPI/SpecialConversion/VersionCandidate.swift
+++ b/Sources/KanaKanjiConverterModule/ConverterAPI/SpecialConversion/VersionCandidate.swift
@@ -20,7 +20,7 @@ extension KanaKanjiConverter {
             return [Candidate(
                 text: versionString,
                 value: -30,
-                correspondingCount: inputData.input.count,
+                composingCount: .inputCount(inputData.input.count),
                 lastMid: MIDData.一般.mid,
                 data: [DicdataElement(word: versionString, ruby: inputData.convertTarget.toKatakana(), cid: CIDData.固有名詞.cid, mid: MIDData.一般.mid, value: -30)]
             )]
diff --git a/Sources/KanaKanjiConverterModule/DictionaryManagement/DicdataStore.swift b/Sources/KanaKanjiConverterModule/DictionaryManagement/DicdataStore.swift
index 1a88a1a..a13cd8a 100644
--- a/Sources/KanaKanjiConverterModule/DictionaryManagement/DicdataStore.swift
+++ b/Sources/KanaKanjiConverterModule/DictionaryManagement/DicdataStore.swift
@@ -427,7 +427,7 @@ public final class DicdataStore {
                 guard let endIndex = stringToInfo[Array($0.ruby)]?.endIndex else {
                     return nil
                 }
-                let node = LatticeNode(data: $0, inputRange: fromIndex ..< endIndex + 1)
+                let node = LatticeNode(data: $0, range: .input(from: fromIndex, to: endIndex + 1))
                 node.prevs.append(RegisteredNode.BOSNode())
                 return node
             }
@@ -437,7 +437,7 @@ public final class DicdataStore {
                 guard let endIndex = stringToInfo[Array($0.ruby)]?.endIndex else {
                     return nil
                 }
-                return LatticeNode(data: $0, inputRange: fromIndex ..< endIndex + 1)
+                return LatticeNode(data: $0, range: .input(from: fromIndex, to: endIndex + 1))
             }
             return result
         }
diff --git a/Sources/KanaKanjiConverterModule/InputManagement/ComposingText.swift b/Sources/KanaKanjiConverterModule/InputManagement/ComposingText.swift
index c51bbe3..e185097 100644
--- a/Sources/KanaKanjiConverterModule/InputManagement/ComposingText.swift
+++ b/Sources/KanaKanjiConverterModule/InputManagement/ComposingText.swift
@@ -341,18 +341,37 @@ public struct ComposingText: Sendable {
     /// 文頭の方を確定させる関数
     ///  - parameters:
     ///   - correspondingCount: `input`において対応する文字数
-    public mutating func prefixComplete(correspondingCount: Int) {
-        let correspondingCount = min(correspondingCount, self.input.count)
-        self.input.removeFirst(correspondingCount)
-        // convetTargetを更新する
-        let newConvertTarget = Self.getConvertTarget(for: self.input)
-        // カーソルの位置は、消す文字数の分削除する
-        let cursorDelta = self.convertTarget.count - newConvertTarget.count
-        self.convertTarget = newConvertTarget
-        self.convertTargetCursorPosition -= cursorDelta
-        // もしも左端にカーソルが位置していたら、文頭に移動させる
-        if self.convertTargetCursorPosition == 0 {
-            self.convertTargetCursorPosition = self.convertTarget.count
+    public mutating func prefixComplete(composingCount: ComposingCount) {
+        switch composingCount {
+        case .inputCount(let correspondingCount):
+            let correspondingCount = min(correspondingCount, self.input.count)
+            self.input.removeFirst(correspondingCount)
+            // convetTargetを更新する
+            let newConvertTarget = Self.getConvertTarget(for: self.input)
+            // カーソルの位置は、消す文字数の分削除する
+            let cursorDelta = self.convertTarget.count - newConvertTarget.count
+            self.convertTarget = newConvertTarget
+            self.convertTargetCursorPosition -= cursorDelta
+            // もしも左端にカーソルが位置していたら、文頭に移動させる
+            if self.convertTargetCursorPosition == 0 {
+                self.convertTargetCursorPosition = self.convertTarget.count
+            }
+        case .surfaceCount(let correspondingCount):
+            // 先頭correspondingCountを削除する操作に相当する
+            // カーソルを移動する
+            let prefix = self.convertTarget.prefix(correspondingCount)
+            let index = self.forceGetInputCursorPosition(target: prefix)
+            self.input = Array(self.input[index...])
+            self.convertTarget = String(self.convertTarget.dropFirst(correspondingCount))
+            self.convertTargetCursorPosition -= correspondingCount
+            // もしも左端にカーソルが位置していたら、文頭に移動させる
+            if self.convertTargetCursorPosition == 0 {
+                self.convertTargetCursorPosition = self.convertTarget.count
+            }
+
+        case .composite(let left, let right):
+            self.prefixComplete(composingCount: left)
+            self.prefixComplete(composingCount: right)
         }
     }
 
@@ -580,17 +599,20 @@ extension ComposingText.ConvertTargetElement: Equatable {}
 extension ComposingText {
     /// 2つの`ComposingText`のデータを比較し、差分を計算する。
     /// `convertTarget`との整合性をとるため、`convertTarget`に合わせた上で比較する
-    func differenceSuffix(to previousData: ComposingText) -> (deleted: Int, addedCount: Int) {
+    func differenceSuffix(to previousData: ComposingText) -> (deletedInput: Int, addedInput: Int, deletedSurface: Int, addedSurface: Int) {
         // k→か、sh→しゃ、のような場合、差分は全てx ... lastの範囲に現れるので、差分計算が問題なく動作する
         // かn → かんs、のような場合、「かんs、んs、s」のようなものは現れるが、「かん」が生成できない
         // 本質的にこれはポリシーの問題であり、「は|しゃ」の変換で「はし」が部分変換として現れないことと同根の問題である。
         // 解決のためには、inputの段階で「ん」をdirectで扱うべきである。
-
         // 差分を計算する
         let common = self.input.commonPrefix(with: previousData.input)
         let deleted = previousData.input.count - common.count
         let added = self.input.dropFirst(common.count).count
-        return (deleted, added)
+
+        let commonSurface = self.convertTarget.commonPrefix(with: previousData.convertTarget)
+        let deletedSurface = previousData.convertTarget.count - commonSurface.count
+        let addedSurface = self.convertTarget.suffix(from: commonSurface.startIndex).count
+        return (deleted, added, deletedSurface, addedSurface)
     }
 
     func inputHasSuffix(inputOf suffix: ComposingText) -> Bool {
diff --git a/Tests/KanaKanjiConverterModuleTests/ClauseDataUnitTests.swift b/Tests/KanaKanjiConverterModuleTests/ClauseDataUnitTests.swift
index 7123f4f..50c5ca2 100644
--- a/Tests/KanaKanjiConverterModuleTests/ClauseDataUnitTests.swift
+++ b/Tests/KanaKanjiConverterModuleTests/ClauseDataUnitTests.swift
@@ -14,19 +14,19 @@ final class ClauseDataUnitTests: XCTestCase {
         do {
             let unit1 = ClauseDataUnit()
             unit1.text = "僕が"
-            unit1.inputRange = 0 ..< 3
+            unit1.range = .input(from: 0, to: 3)
             unit1.mid = 0
             unit1.nextLcid = 0
 
             let unit2 = ClauseDataUnit()
             unit2.text = "走る"
-            unit2.inputRange = 3 ..< 6
+            unit2.range = .input(from: 3, to: 6)
             unit2.mid = 1
             unit2.nextLcid = 1
 
             unit1.merge(with: unit2)
             XCTAssertEqual(unit1.text, "僕が走る")
-            XCTAssertEqual(unit1.inputRange, 0 ..< 6)
+            XCTAssertEqual(unit1.range, .input(from: 0, to: 6))
             XCTAssertEqual(unit1.nextLcid, 1)
             XCTAssertEqual(unit1.mid, 0)
         }
@@ -34,19 +34,19 @@ final class ClauseDataUnitTests: XCTestCase {
         do {
             let unit1 = ClauseDataUnit()
             unit1.text = "君は"
-            unit1.inputRange = 0 ..< 3
+            unit1.range = .input(from: 0, to: 3)
             unit1.mid = 0
             unit1.nextLcid = 0
 
             let unit2 = ClauseDataUnit()
             unit2.text = "笑った"
-            unit2.inputRange = 3 ..< 7
+            unit2.range = .input(from: 3, to: 7)
             unit2.mid = 3
             unit2.nextLcid = 3
 
             unit1.merge(with: unit2)
             XCTAssertEqual(unit1.text, "君は笑った")
-            XCTAssertEqual(unit1.inputRange, 0 ..< 7)
+            XCTAssertEqual(unit1.range, .input(from: 0, to: 7))
             XCTAssertEqual(unit1.nextLcid, 3)
             XCTAssertEqual(unit1.mid, 0)
         }
diff --git a/Tests/KanaKanjiConverterModuleTests/ComposingTextTests.swift b/Tests/KanaKanjiConverterModuleTests/ComposingTextTests.swift
index 440e6be..da96691 100644
--- a/Tests/KanaKanjiConverterModuleTests/ComposingTextTests.swift
+++ b/Tests/KanaKanjiConverterModuleTests/ComposingTextTests.swift
@@ -202,8 +202,8 @@ final class ComposingTextTests: XCTestCase {
             var c2 = ComposingText()
             c2.insertAtCursorPosition("hasiru", inputStyle: .roman2kana)
 
-            XCTAssertEqual(c2.differenceSuffix(to: c1).deleted, 0)
-            XCTAssertEqual(c2.differenceSuffix(to: c1).addedCount, 1)
+            XCTAssertEqual(c2.differenceSuffix(to: c1).deletedInput, 0)
+            XCTAssertEqual(c2.differenceSuffix(to: c1).addedInput, 1)
         }
         do {
             var c1 = ComposingText()
@@ -212,8 +212,8 @@ final class ComposingTextTests: XCTestCase {
             var c2 = ComposingText()
             c2.insertAtCursorPosition("tukatte", inputStyle: .roman2kana)
 
-            XCTAssertEqual(c2.differenceSuffix(to: c1).deleted, 0)
-            XCTAssertEqual(c2.differenceSuffix(to: c1).addedCount, 1)
+            XCTAssertEqual(c2.differenceSuffix(to: c1).deletedInput, 0)
+            XCTAssertEqual(c2.differenceSuffix(to: c1).addedInput, 1)
         }
     }
 }
diff --git a/Tests/KanaKanjiConverterModuleTests/ConverterTests/CandidateTests.swift b/Tests/KanaKanjiConverterModuleTests/ConverterTests/CandidateTests.swift
index 33e8255..5b31cdb 100644
--- a/Tests/KanaKanjiConverterModuleTests/ConverterTests/CandidateTests.swift
+++ b/Tests/KanaKanjiConverterModuleTests/ConverterTests/CandidateTests.swift
@@ -16,7 +16,7 @@ final class CandidateTests: XCTestCase {
             let candidate = Candidate(
                 text: text,
                 value: -40,
-                correspondingCount: 4,
+                composingCount: .inputCount(4),
                 lastMid: 5,
                 data: [DicdataElement(word: text, ruby: "サイコロ", cid: 0, mid: 5, value: -40)]
             )
@@ -27,7 +27,7 @@ final class CandidateTests: XCTestCase {
                 print(candidate2.text)
                 XCTAssertTrue(Set((1...3).map(String.init)).contains(candidate2.text))
                 XCTAssertEqual(candidate.value, candidate2.value)
-                XCTAssertEqual(candidate.correspondingCount, candidate2.correspondingCount)
+                XCTAssertEqual(candidate.composingCount, candidate2.composingCount)
                 XCTAssertEqual(candidate.lastMid, candidate2.lastMid)
                 XCTAssertEqual(candidate.data, candidate2.data)
                 XCTAssertEqual(candidate.actions, candidate2.actions)
@@ -38,7 +38,7 @@ final class CandidateTests: XCTestCase {
             let candidate = Candidate(
                 text: text,
                 value: 0,
-                correspondingCount: 0,
+                composingCount: .inputCount(0),
                 lastMid: 0,
                 data: [DicdataElement(word: text, ruby: "", cid: 0, mid: 0, value: 0)]
             )
diff --git a/Tests/KanaKanjiConverterModuleTests/LearningMemoryTests.swift b/Tests/KanaKanjiConverterModuleTests/LearningMemoryTests.swift
index 573b474..9ba57d4 100644
--- a/Tests/KanaKanjiConverterModuleTests/LearningMemoryTests.swift
+++ b/Tests/KanaKanjiConverterModuleTests/LearningMemoryTests.swift
@@ -88,7 +88,7 @@ final class LearningMemoryTests: XCTestCase {
                 Candidate(
                     text: element.word,
                     value: element.value(),
-                    correspondingCount: 3,
+                    composingCount: .inputCount(3),
                     lastMid: element.mid,
                     data: [element]
                 )
@@ -128,7 +128,7 @@ final class LearningMemoryTests: XCTestCase {
                 Candidate(
                     text: element.word,
                     value: element.value(),
-                    correspondingCount: 3,
+                    composingCount: .inputCount(3),
                     lastMid: element.mid,
                     data: [element]
                 )
diff --git a/Tests/KanaKanjiConverterModuleTests/RegisteredNodeTests.swift b/Tests/KanaKanjiConverterModuleTests/RegisteredNodeTests.swift
index 54aabda..d498b41 100644
--- a/Tests/KanaKanjiConverterModuleTests/RegisteredNodeTests.swift
+++ b/Tests/KanaKanjiConverterModuleTests/RegisteredNodeTests.swift
@@ -12,16 +12,16 @@ import XCTest
 final class RegisteredNodeTests: XCTestCase {
     func testBOSNode() throws {
         let bos = RegisteredNode.BOSNode()
-        XCTAssertEqual(bos.inputRange, 0..<0)
+        XCTAssertEqual(bos.range, Lattice.LatticeRange.zero)
         XCTAssertNil(bos.prev)
         XCTAssertEqual(bos.totalValue, 0)
         XCTAssertEqual(bos.data.rcid, CIDData.BOS.cid)
     }
 
     func testFromLastCandidate() throws {
-        let candidate = Candidate(text: "我輩は猫", value: -20, correspondingCount: 7, lastMid: 100, data: [DicdataElement(word: "我輩は猫", ruby: "ワガハイハネコ", cid: CIDData.一般名詞.cid, mid: 100, value: -20)])
+        let candidate = Candidate(text: "我輩は猫", value: -20, composingCount: .inputCount(7), lastMid: 100, data: [DicdataElement(word: "我輩は猫", ruby: "ワガハイハネコ", cid: CIDData.一般名詞.cid, mid: 100, value: -20)])
         let bos = RegisteredNode.fromLastCandidate(candidate)
-        XCTAssertEqual(bos.inputRange, 0..<0)
+        XCTAssertEqual(bos.range, Lattice.LatticeRange.zero)
         XCTAssertNil(bos.prev)
         XCTAssertEqual(bos.totalValue, 0)
         XCTAssertEqual(bos.data.rcid, CIDData.一般名詞.cid)
@@ -34,37 +34,37 @@ final class RegisteredNodeTests: XCTestCase {
             data: DicdataElement(word: "我輩", ruby: "ワガハイ", cid: CIDData.一般名詞.cid, mid: 1, value: -5),
             registered: bos,
             totalValue: -10,
-            inputRange: 0..<4
+            range: .input(from: 0, to: 4)
         )
         let node2 = RegisteredNode(
             data: DicdataElement(word: "は", ruby: "ハ", cid: CIDData.係助詞ハ.cid, mid: 2, value: -2),
             registered: node1,
             totalValue: -13,
-            inputRange: 4..<5
+            range: .input(from: 4, to: 5)
         )
         let node3 = RegisteredNode(
             data: DicdataElement(word: "猫", ruby: "ネコ", cid: CIDData.一般名詞.cid, mid: 3, value: -4),
             registered: node2,
             totalValue: -20,
-            inputRange: 5..<7
+            range: .input(from: 5, to: 7)
         )
         let node4 = RegisteredNode(
             data: DicdataElement(word: "です", ruby: "デス", cid: CIDData.助動詞デス基本形.cid, mid: 4, value: -3),
             registered: node3,
             totalValue: -25,
-            inputRange: 7..<9
+            range: .input(from: 7, to: 9)
         )
         let result = node4.getCandidateData()
         let clause1 = ClauseDataUnit()
         clause1.text = "我輩は"
         clause1.nextLcid = CIDData.一般名詞.cid
-        clause1.inputRange = 0..<5
+        clause1.range = .input(from: 0, to: 5)
         clause1.mid = 1
 
         let clause2 = ClauseDataUnit()
         clause2.text = "猫です"
         clause2.nextLcid = CIDData.EOS.cid
-        clause2.inputRange = 5..<9
+        clause2.range = .input(from: 5, to: 9)
         clause2.mid = 3
 
         let expectedResult: CandidateData = CandidateData(
diff --git a/Tests/KanaKanjiConverterModuleWithDefaultDictionaryTests/DicdataStoreTests/DicdataStoreTests.swift b/Tests/KanaKanjiConverterModuleWithDefaultDictionaryTests/DicdataStoreTests/DicdataStoreTests.swift
index 556e7c8..70e12b7 100644
--- a/Tests/KanaKanjiConverterModuleWithDefaultDictionaryTests/DicdataStoreTests/DicdataStoreTests.swift
+++ b/Tests/KanaKanjiConverterModuleWithDefaultDictionaryTests/DicdataStoreTests/DicdataStoreTests.swift
@@ -290,7 +290,7 @@ final class DicdataStoreTests: XCTestCase {
             sequentialInput(&c, sequence: "tesutowaーdo", inputStyle: .roman2kana)
             let result = dicdataStore.getLOUDSDataInRange(inputData: c, from: 0, toIndexRange: c.input.endIndex - 1 ..< c.input.endIndex, needTypoCorrection: false)
             XCTAssertTrue(result.contains(where: {$0.data.word == "テストワード"}))
-            XCTAssertEqual(result.first(where: {$0.data.word == "テストワード"})?.inputRange, 0 ..< 11)
+            XCTAssertEqual(result.first(where: {$0.data.word == "テストワード"})?.range, .input(from: 0, to: 11))
         }
         
         // 動的ユーザ辞書の単語が通常の辞書よりも優先されることのテスト