A question answering data edition device can extracts an expression pattern including a state/condition when question answering data is actually used in a dialogue. The question answering data edition device includes: a matching condition input unit (10) for specifying a condition of dialogue history data and question answering data to be processed; a dialogue history database (20) containing existing dialogue history data; a question answering database (30) containing existing question answering data; a matching unit (40) for matching the dialogue history data with the question answering data; an additional information extraction unit (50) for extracting information such as a state and a condition to be added to the question answering data and its index, from the matching resu an additional information accumulation unit (60) for temporarily recording/accumulating additional information extracted; and a question answering data edition unit (70) for editing the accumulated additional information.
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