6. The method of claim 1 , wherein analyzing the morpheme further comprises: analyzing the morpheme of the morpheme analysis target by referring to the morpheme dictionary.
6. The method of claim 1 , wherein analyzing the morpheme further comprises: analyzing the morpheme of the morpheme analysis target by referring to the morpheme dictionary. 7. The method of claim 6 , further comprising: adding the morpheme analysis target to a frequently utilized word list for each category, and increasing a number of times that a corresponding word is utilized, wherein the category information is expanded by using information of the frequently utilized word list in response to the morpheme analysis being performed.