diff --git a/src/main/java/org/codelibs/fess/app/web/api/admin/suggest/ApiAdminSuggestAction.java b/src/main/java/org/codelibs/fess/app/web/api/admin/suggest/ApiAdminSuggestAction.java
new file mode 100644
index 000000000..7bc28f028
--- /dev/null
+++ b/src/main/java/org/codelibs/fess/app/web/api/admin/suggest/ApiAdminSuggestAction.java
@@ -0,0 +1,67 @@
+/*
+ * Copyright 2012-2017 CodeLibs Project and the Others.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
+ * either express or implied. See the License for the specific language
+ * governing permissions and limitations under the License.
+ */
+package org.codelibs.fess.app.web.api.admin.suggest;
+
+import org.codelibs.fess.app.web.api.ApiResult;
+import org.codelibs.fess.app.web.api.admin.FessApiAdminAction;
+import org.codelibs.fess.helper.SuggestHelper;
+import org.lastaflute.web.Execute;
+import org.lastaflute.web.response.JsonResponse;
+
+import javax.annotation.Resource;
+
+public class ApiAdminSuggestAction extends FessApiAdminAction {
+
+    @Resource
+    protected SuggestHelper suggestHelper;
+
+    // GET /api/admin/suggest
+    @Execute
+    public JsonResponse<ApiResult> get$index() {
+        final SuggestBody body = new SuggestBody();
+        body.totalWordsNum = suggestHelper.getAllWordsNum();
+        body.documentWordsNum = suggestHelper.getDocumentWordsNum();
+        body.queryWordsNum = suggestHelper.getQueryWordsNum();
+        return asJson(new ApiResult.ApiConfigResponse().setting(body).status(ApiResult.Status.OK).result());
+    }
+
+    // DELETE /api/admin/suggest/all
+    @Execute
+    public JsonResponse<ApiResult> delete$all() {
+        if (!suggestHelper.deleteAllWords()) {
+            throwValidationErrorApi(messages -> messages.addErrorsFailedToDeleteDocInAdmin(GLOBAL));
+        }
+        return asJson(new ApiResult.ApiResponse().status(ApiResult.Status.OK).result());
+    }
+
+    // DELETE /api/admin/suggest/document
+    @Execute
+    public JsonResponse<ApiResult> delete$document() {
+        if (!suggestHelper.deleteDocumentWords()) {
+            throwValidationErrorApi(messages -> messages.addErrorsFailedToDeleteDocInAdmin(GLOBAL));
+        }
+        return asJson(new ApiResult.ApiResponse().status(ApiResult.Status.OK).result());
+    }
+
+    // DELETE /api/admin/suggest/query
+    @Execute
+    public JsonResponse<ApiResult> delete$query() {
+        if (!suggestHelper.deleteQueryWords()) {
+            throwValidationErrorApi(messages -> messages.addErrorsFailedToDeleteDocInAdmin(GLOBAL));
+        }
+        return asJson(new ApiResult.ApiResponse().status(ApiResult.Status.OK).result());
+    }
+}
diff --git a/src/main/java/org/codelibs/fess/app/web/api/admin/suggest/SuggestBody.java b/src/main/java/org/codelibs/fess/app/web/api/admin/suggest/SuggestBody.java
new file mode 100644
index 000000000..8390cd5c5
--- /dev/null
+++ b/src/main/java/org/codelibs/fess/app/web/api/admin/suggest/SuggestBody.java
@@ -0,0 +1,11 @@
+package org.codelibs.fess.app.web.api.admin.suggest;
+
+import org.codelibs.fess.app.web.admin.suggest.SuggestForm;
+
+public class SuggestBody extends SuggestForm {
+    public Long totalWordsNum;
+
+    public Long documentWordsNum;
+
+    public Long queryWordsNum;
+}