diff --git a/processor/src/main/java/one/nem/lacerta/processor/DocumentProcessor.java b/processor/src/main/java/one/nem/lacerta/processor/DocumentProcessor.java
index 8a967ff0..5876fc4d 100644
--- a/processor/src/main/java/one/nem/lacerta/processor/DocumentProcessor.java
+++ b/processor/src/main/java/one/nem/lacerta/processor/DocumentProcessor.java
@@ -7,13 +7,13 @@ import one.nem.lacerta.model.document.DocumentDetail;
 public interface DocumentProcessor {
 
     // ページ操作
-    void addNewPageToLast(Bitmap bitmap) throws Exception;
-    void addNewPagesToLast(Bitmap[] bitmaps) throws Exception;
-    void insertPageAtIndex(Bitmap bitmap, int index) throws Exception;
-    void removePageAtIndex(int index) throws Exception;
+    DocumentProcessor addNewPageToLast(Bitmap bitmap) throws Exception;
+    DocumentProcessor addNewPagesToLast(Bitmap[] bitmaps) throws Exception;
+    DocumentProcessor insertPageAtIndex(Bitmap bitmap, int index) throws Exception;
+    DocumentProcessor removePageAtIndex(int index) throws Exception;
 
     // 更新
-    void updatePageAtIndex(Bitmap bitmap, int index);
+    DocumentProcessor updatePageAtIndex(Bitmap bitmap, int index);
 
     // ページ取得
     Bitmap getPageAtIndex(int index);
diff --git a/processor/src/main/java/one/nem/lacerta/processor/impl/DocumentProcessorImpl.java b/processor/src/main/java/one/nem/lacerta/processor/impl/DocumentProcessorImpl.java
index 90cc7cf7..70ff5708 100644
--- a/processor/src/main/java/one/nem/lacerta/processor/impl/DocumentProcessorImpl.java
+++ b/processor/src/main/java/one/nem/lacerta/processor/impl/DocumentProcessorImpl.java
@@ -70,7 +70,7 @@ public class DocumentProcessorImpl implements DocumentProcessor{
 
 
     @Override
-    public void addNewPageToLast(Bitmap bitmap) throws Exception{
+    public DocumentProcessor addNewPageToLast(Bitmap bitmap) throws Exception{
         logger.debug("addNewPageToLast", "called");
         String filename = UUID.randomUUID().toString() + ".png"; // TODO-rca: 拡張子を動的にする
 
@@ -88,7 +88,7 @@ public class DocumentProcessorImpl implements DocumentProcessor{
     }
 
     @Override
-    public void addNewPagesToLast(Bitmap[] bitmaps) throws Exception{
+    public DocumentProcessor addNewPagesToLast(Bitmap[] bitmaps) throws Exception{
         logger.debug("addNewPagesToLast", "called");
 
         for (Bitmap bitmap : bitmaps) {
@@ -97,7 +97,7 @@ public class DocumentProcessorImpl implements DocumentProcessor{
     }
 
     @Override
-    public void insertPageAtIndex(Bitmap bitmap, int index) throws Exception {
+    public DocumentProcessor insertPageAtIndex(Bitmap bitmap, int index) throws Exception {
         logger.debug("addNewPageAfterIndex", "called");
         String filename = UUID.randomUUID().toString() + ".png"; // TODO-rca: 拡張子を動的にする
 
@@ -112,12 +112,12 @@ public class DocumentProcessorImpl implements DocumentProcessor{
     }
 
     @Override
-    public void removePageAtIndex(int index) {
+    public DocumentProcessor removePageAtIndex(int index) {
 
     }
 
     @Override
-    public void updatePageAtIndex(Bitmap bitmap, int index) {
+    public DocumentProcessor updatePageAtIndex(Bitmap bitmap, int index) {
 
     }