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 4ad9e108..b611e6c1 100644
--- a/processor/src/main/java/one/nem/lacerta/processor/DocumentProcessor.java
+++ b/processor/src/main/java/one/nem/lacerta/processor/DocumentProcessor.java
@@ -19,5 +19,6 @@ public interface DocumentProcessor {
     int getPageCount();
 
     void close();
+    void init();
 
 }
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 ecc2d6f9..8c6cd4f1 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
@@ -32,7 +32,11 @@ public class DocumentProcessorImpl implements DocumentProcessor{
     @Inject
     LacertaLogger logger;
 
-    // Internal utils
+    @Override
+    public void init() {
+        logger.debug("init", "called");
+        // TODO-rca: ドキュメントの初期化処理
+    }
 
     @Override
     public void addNewPageToLast(Bitmap bitmap) {