diff --git a/src/audio_query.rs b/src/audio_query.rs
new file mode 100644
index 0000000..765a9d9
--- /dev/null
+++ b/src/audio_query.rs
@@ -0,0 +1,22 @@
+use crate::{restapi::RestAPI, types::audio_query::AudioQueryType};
+use bytes::Bytes;
+use reqwest::Result;
+
+pub struct AudioQuery {
+    restapi: RestAPI,
+    audio_query: AudioQueryType,
+}
+
+impl AudioQuery {
+    pub fn new(restapi: RestAPI, audio_query: AudioQueryType) -> Self {
+        Self {
+            restapi,
+            audio_query,
+        }
+    }
+
+    pub async fn synthesis(&self, speaker: i32) -> Result<Bytes> {
+        let data = self.restapi.synthesis(&self.audio_query, speaker).await?;
+        Ok(data)
+    }
+}
diff --git a/src/client.rs b/src/client.rs
index 6b7af9e..27cbe77 100644
--- a/src/client.rs
+++ b/src/client.rs
@@ -1,4 +1,5 @@
-use crate::restapi::RestAPI;
+use crate::{audio_query::AudioQuery, restapi::RestAPI, types::audio_query::AudioQueryType};
+use reqwest::Result;
 
 pub struct Client {
     restapi: RestAPI,
@@ -10,4 +11,14 @@ impl Client {
             restapi: RestAPI::new(base_path),
         }
     }
-}
\ No newline at end of file
+
+    pub async fn create_audio_query(
+        &self,
+        text: &str,
+        core_version: Option<&str>,
+    ) -> Result<AudioQuery> {
+        let data: AudioQueryType = self.restapi.create_audio_query(text, core_version).await?;
+        let audio_query = AudioQuery::new(self.restapi.clone(), data);
+        Ok(audio_query)
+    }
+}
diff --git a/src/lib.rs b/src/lib.rs
index 281d2af..c0e78cf 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -1,8 +1,9 @@
+mod audio_query;
+mod client;
+mod restapi;
 mod types;
 
-pub fn add(left: usize, right: usize) -> usize {
-    left + right
-}
+pub use client::Client;
 
 #[cfg(test)]
 mod tests {
@@ -10,7 +11,12 @@ mod tests {
 
     #[test]
     fn it_works() {
-        let result = add(2, 2);
-        assert_eq!(result, 4);
+        let client = Client::new("http://localhost:50021");
+        let audio_query = client.create_audio_query("こんにちは", 1)
+            .await
+            .unwrap();
+        audio_query.synthesis(1)
+            .await
+            .unwrap();
     }
 }
diff --git a/src/restapi.rs b/src/restapi.rs
index 481d336..e1bf152 100644
--- a/src/restapi.rs
+++ b/src/restapi.rs
@@ -1,7 +1,8 @@
-use reqwest::{Client, RequestBuilder, Result};
 use crate::types::audio_query::AudioQueryType;
 use bytes::Bytes;
+use reqwest::{Client, RequestBuilder, Result};
 
+#[derive(Clone)]
 pub struct RestAPI {
     base_path: String,
     client: Client,
@@ -16,29 +17,40 @@ impl RestAPI {
     }
 
     pub fn request(&self, method: &str, path: &str) -> RequestBuilder {
-        self.client
-            .request(method.parse().unwrap(), &format!("{}{}", self.base_path, path))
+        self.client.request(
+            method.parse().unwrap(),
+            format!("{}{}", self.base_path, path),
+        )
     }
 
-    pub async fn create_audio_query(&self, text: &str, core_version: Option<&str>) -> Result<AudioQueryType> {
-        let mut params = vec![("text", text)];
+    pub async fn create_audio_query(
+        &self, speaker: i32,
+        text: &str,
+        core_version: Option<&str>,
+    ) -> Result<AudioQueryType> {
+        let mut params = vec![("text", text), ("speaker", speaker)];
         if let Some(core_version) = core_version {
             params.push(("core_version", core_version))
         }
-        self.request("POST", "/audio_query")
-            .param(&params)
+        let data: AudioQueryType = self
+            .request("POST", "/audio_query")
+            .query(&params)
             .send()
             .await?
             .json()
-            .await?
+            .await?;
+        Ok(data)
     }
 
-    pub async fn synthesis(&self, audio_query: &AudioQueryType) -> Result<Bytes> {
-        self.request("POST", "/synthesis")
+    pub async fn synthesis(&self, audio_query: &AudioQueryType, speaker: i32) -> Result<Bytes> {
+        let data = self
+            .request("POST", "/synthesis")
             .json(audio_query)
+            .query(&[("speaker", speaker)])
             .send()
             .await?
             .bytes()
-            .await?
+            .await?;
+        Ok(data)
     }
-}
\ No newline at end of file
+}
diff --git a/src/types/mod.rs b/src/types/mod.rs
index f938474..6fa1a3a 100644
--- a/src/types/mod.rs
+++ b/src/types/mod.rs
@@ -1 +1 @@
-mod audio_query;
+pub mod audio_query;