diff --git a/fess-crawler/src/main/java/org/codelibs/fess/crawler/extractor/Extractor.java b/fess-crawler/src/main/java/org/codelibs/fess/crawler/extractor/Extractor.java
index 4950a386..969688ae 100644
--- a/fess-crawler/src/main/java/org/codelibs/fess/crawler/extractor/Extractor.java
+++ b/fess-crawler/src/main/java/org/codelibs/fess/crawler/extractor/Extractor.java
@@ -28,4 +28,8 @@ public interface Extractor {
 
     ExtractData getText(InputStream in, Map<String, String> params);
 
+    default int getWeight() {
+        return 1;
+    }
+
 }
diff --git a/fess-crawler/src/main/java/org/codelibs/fess/crawler/extractor/ExtractorFactory.java b/fess-crawler/src/main/java/org/codelibs/fess/crawler/extractor/ExtractorFactory.java
index 29fa17a5..ac3a2856 100644
--- a/fess-crawler/src/main/java/org/codelibs/fess/crawler/extractor/ExtractorFactory.java
+++ b/fess-crawler/src/main/java/org/codelibs/fess/crawler/extractor/ExtractorFactory.java
@@ -48,6 +48,15 @@ public void addExtractor(final String key, final Extractor extractor) {
         if (extractor == null) {
             throw new CrawlerSystemException("The extractor is null.");
         }
+        if (extractorMap.containsKey(key)) {
+            final Extractor oldExtractor = extractorMap.get(key);
+            if (oldExtractor.getWeight() > extractor.getWeight()) {
+                if (logger.isDebugEnabled()) {
+                    logger.debug("Ignored {} on {}. Use {}.", extractor.getClass().getName(), key, oldExtractor.getClass().getName());
+                }
+                return;
+            }
+        }
         extractorMap.put(key, extractor);
         if (logger.isDebugEnabled()) {
             logger.debug("Loaded {} : {}", key, extractor.getClass().getName());
diff --git a/fess-crawler/src/test/java/org/codelibs/fess/crawler/extractor/ExtractorFactoryTest.java b/fess-crawler/src/test/java/org/codelibs/fess/crawler/extractor/ExtractorFactoryTest.java
index b29894df..4f72c4fa 100644
--- a/fess-crawler/src/test/java/org/codelibs/fess/crawler/extractor/ExtractorFactoryTest.java
+++ b/fess-crawler/src/test/java/org/codelibs/fess/crawler/extractor/ExtractorFactoryTest.java
@@ -123,4 +123,40 @@ public void test_builder() {
         assertEquals("test",
                 extractorFactory.builder(new ByteArrayInputStream("test".getBytes()), null).filename("test.txt").extract().getContent());
     }
+
+    public void test_addExtractor_weight() {
+        final String key = "application/test";
+        assertNull(extractorFactory.getExtractor(key));
+        extractorFactory.addExtractor(key, new Extractor() {
+            @Override
+            public ExtractData getText(InputStream in, Map<String, String> params) {
+                return null;
+            }
+        });
+        assertEquals(1, extractorFactory.getExtractor(key).getWeight());
+        extractorFactory.addExtractor(key, new Extractor() {
+            @Override
+            public ExtractData getText(InputStream in, Map<String, String> params) {
+                return null;
+            }
+
+            @Override
+            public int getWeight() {
+                return 10;
+            }
+        });
+        assertEquals(10, extractorFactory.getExtractor(key).getWeight());
+        extractorFactory.addExtractor(key, new Extractor() {
+            @Override
+            public ExtractData getText(InputStream in, Map<String, String> params) {
+                return null;
+            }
+
+            @Override
+            public int getWeight() {
+                return 5;
+            }
+        });
+        assertEquals(10, extractorFactory.getExtractor(key).getWeight());
+    }
 }