7. A question and answer data editing method of editing the content of a dialogue to generate question and answer data, comprising: detecting a first question part or a first answer part from a history data of the content of the dialogue as being similar to a first question and answer data in existing question and answer data; extracting a) a second answer part from the history data, when a second question part in the history data is similar to the first question and answer data and the second answer part in the history data is not similar to the first question and answer data, and b) a third question part from the history data, when a third answer part in the history data is similar to the first question and answer data and the third question part is not similar to the first question and answer data; and registering said third question part or said second answer part from said content of the dialogue as a variation of said first question and answer data.
8. The question and answer data editing method according to claim 7 , further comprising a step of presenting said extracted question and answer data in said content of the dialogue or a part of said extracted question and answer data so as to be edited in correlation with said existing question and answer data extracted.