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 4e6631e6..e822e683 100644
--- a/processor/src/main/java/one/nem/lacerta/processor/DocumentProcessor.java
+++ b/processor/src/main/java/one/nem/lacerta/processor/DocumentProcessor.java
@@ -1,4 +1,20 @@
 package one.nem.lacerta.processor;
 
+import android.graphics.Bitmap;
+
 public interface DocumentProcessor {
+
+    // ページ操作
+    void addNewPageToLast(Bitmap bitmap);
+    void addNewPageAfterIndex(Bitmap bitmap, int index);
+    void addNewPageBeforeIndex(Bitmap bitmap, int index);
+    void removePageAtIndex(int index);
+
+    // 更新
+    void updatePageAtIndex(Bitmap bitmap, int index);
+
+    // ページ取得
+    Bitmap getPageAtIndex(int index);
+    int getPageCount();
+
 }