To use Kanji characters of a set Kanji level in converting a Kana character string into a Kanji-Kana mixture character string and use character strings other than Kanji for Kanji characters of levels higher than the set Kanji level, thereby improving a conversion process that matches a user's Kanji level in that analysis errors are likely to occur in morphological analysis on text data where Kana is frequently used, because each word is registered in a generally used form in a word dictionary used for the morphological analysis.

When performing morphological analysis on text data, a control unit 1 acquires via an operating unit 5 the level of proficiency of Kanji corresponding to the text data. The control unit 1 converts the Kanji characters of each word registered in a basic word dictionary 4a that are on higher levels of proficiency than the level of proficiency acquired into Kana for registration in an analysis dictionary. The control unit 1 then performs morphological analysis on the text data according to the content thus registered in the analysis dictionary.

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