PURPOSE:To perform the KANA (Japanese syllabary)/KANJI (Chinese character) conversion of the ancient classics without using any dictionary exclusive for the ancient classics. CONSTITUTION:A word stem extraction processing part is provided to extract the word stem part out of an inputted HIRAGANA (cursive form of Japanese syllabary) character together with a modern word conversion processing part which generates the modern words based on the word stem parts extracted by the part 18c1 and obtains the KANA/KANJI conversion results of the modern words through a KANA/KANJI conversion processing part 18a and with use of a dictionary 18b, and a word ending restoration processing part 18c3 which restores the word ending obtained from the KANA/KANJI conversion of the part 18c2 to the word ending part of the input HIRAGANA character string.
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