10. The method of claim 9 , wherein the keyword is detected by extracting a stop word from words included in a mapping table and query words, all parts or some parts of tag information included in the web document being written in the mapping table.
10. The method of claim 9 , wherein the keyword is detected by extracting a stop word from words included in a mapping table and query words, all parts or some parts of tag information included in the web document being written in the mapping table. 11. The method of claim 10 , wherein the weight is subtracted for the keyword that is not selected by a user although the keyword is included in the mapping table or the user profile.