4. The method of claim 3 , wherein creating the combined key comprises creating the combined key by combining the first key and the second key, and wherein analyzing the morpheme comprises analyzing the morpheme of the morpheme analysis target by using the created combined key.
3. The method of claim 2 , wherein creating the plurality of keys comprises: creating a first key by analyzing a morpheme of the category information; and creating a second key by analyzing a morpheme of the address information.