diff --git a/src/main/java/org/ntlab/citrusserver/entities/Book.java b/src/main/java/org/ntlab/citrusserver/entities/Book.java
index c68c40e..08a7d4b 100644
--- a/src/main/java/org/ntlab/citrusserver/entities/Book.java
+++ b/src/main/java/org/ntlab/citrusserver/entities/Book.java
@@ -8,6 +8,7 @@
     private String color;
     private String accountId;
     private String time;
+    private int favoriteCount;
 
 
     public Book(String accountId, Integer bookId, String title, boolean publicity, String color, String time) {
@@ -19,6 +20,7 @@
         this.color = color;
 
         this.time = time;
+        this.favoriteCount = 0;
     }
 
 
@@ -34,4 +36,6 @@
     public String getAccountId() {return accountId;}
     public void setTime(String t) {time = t;}
     public String getTime() {return time;}
+    public void setFavoritedCount(int f) {favoriteCount = f;}
+    public int getFavoritedCount() {return favoriteCount;}
 }
diff --git a/src/main/java/org/ntlab/citrusserver/repositories/BookManager.java b/src/main/java/org/ntlab/citrusserver/repositories/BookManager.java
index 5b0012e..d8ca937 100644
--- a/src/main/java/org/ntlab/citrusserver/repositories/BookManager.java
+++ b/src/main/java/org/ntlab/citrusserver/repositories/BookManager.java
@@ -121,6 +121,16 @@
             booksMap.get(accountId).get(bookId).setColor(color);
     }
 
+    public void registerFavoriteCount(String accountId, Integer bookId){
+        int favoriteCount = booksMap.get(accountId).get(bookId).getFavoritedCount();
+        booksMap.get(accountId).get(bookId).setFavoritedCount(favoriteCount + 1);
+    }
+
+    public void unregisterFavoriteCount(String accountId, Integer bookId){
+        int favoriteCount = booksMap.get(accountId).get(bookId).getFavoritedCount();
+        booksMap.get(accountId).get(bookId).setFavoritedCount(favoriteCount - 1);
+    }
+
     @Override
     public void accountDeleted(Account account) {
         if(!booksMap.containsKey(account.getId())) return;
diff --git a/src/main/java/org/ntlab/citrusserver/resources/BooksRest.java b/src/main/java/org/ntlab/citrusserver/resources/BooksRest.java
index 02dd8f3..5dcacc7 100644
--- a/src/main/java/org/ntlab/citrusserver/resources/BooksRest.java
+++ b/src/main/java/org/ntlab/citrusserver/resources/BooksRest.java
@@ -147,6 +147,26 @@
         return "success";
     }
 
+    @Path("/{account_id}/books/{book_id}/favoriteCount")
+    @PUT
+    @Consumes(MediaType.APPLICATION_FORM_URLENCODED)
+    public String registerFavoriteCount(@PathParam("account_id") String account_id, @PathParam("book_id") Integer book_id){
+
+        accountCheck(account_id);
+        bookManager.registerFavoriteCount(account_id, book_id);
+        return "success";
+    }
+
+    @Path("/{account_id}/books/{book_id}/favoriteCount")
+    @PUT
+    @Consumes(MediaType.APPLICATION_FORM_URLENCODED)
+    public String unregisterFavoriteCount(@PathParam("account_id") String account_id, @PathParam("book_id") Integer book_id){
+
+        accountCheck(account_id);
+        bookManager.unregisterFavoriteCount(account_id, book_id);
+        return "success";
+    }
+
     ///---------------------------------------------------------------------
     ///private
     ///---------------------------------------------------------------------