17. The question answering method of claim 13 , wherein the creating of the question-intermediate expression of the lexicon level comprises recognizing a question focus from the natural language question, and creating a lexicon level-query format based on a semantic frame including the question focus.
18. The question answering method of claim 17 , wherein the creating of the question-intermediate expression of the lexicon level comprises creating the query format by only using a result of a semantic analysis of the natural language question without assuming a certain knowledgebase.