When registering question data (Q), a reply processing device (101) morphologically analyzes the question data (Q) and extracts a word included in the question data (Q). The reply processing device (101) presents candidate words for a target word to be set as a synonym for the extracted word. When the reply processing device (101) receives a selection of one of the presented candidate words as a target word to be set as a synonym for the extracted word, the reply processing device (101) learns to associate both the question data (Q) and question data (Q'), which is obtained by replacing a word in the question data (Q) by the selected word, with the same answer data (A).
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