A third sentence obtained by replacing a first phrase of a first sentence with a second phrase is input, and it is judged whether a third phrase is included in a first database including at least a phrase used in written text. If the third phrase is not included, a first evaluation value in the first database is calculated for a seventh phrase obtained by replacing the second phrase of the third phrase with a sixth phrase. It is judged whether the third phrase is included in a second database including at least a phrase used in spoken text and whether a second evaluation value calculated from the first evaluation value satisfies a predetermined condition. If the third phrase is included, and the second evaluation value satisfies the predetermined condition, the third sentence and the second sentence as a pair are added to a bilingual corpus.
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