4. The question answering system according to claim 1 , further comprising: a question meaning analysis unit extracts a question focus and a modifier modifying the question focus from the input question, and analyzes a lexical meaning of the modifier as the lexical meaning of the specific word of the input question.
4. The question answering system according to claim 1 , further comprising: a question meaning analysis unit extracts a question focus and a modifier modifying the question focus from the input question, and analyzes a lexical meaning of the modifier as the lexical meaning of the specific word of the input question. 7. The question answering system according to claim 4 , wherein: the question meaning analysis unit executes syntactic and semantic analysis processing of the input question to extract the question focus and the modifier from the input question.