PURPOSE:To automatically register a part of a word which is difficult to convert just enough and to reduce the burden of a user by holding a fair copy where a part of reading lacks as it is, automatically correcting a lacked part by referring to a reading/Japanese reading dictionary at the time of inputting reading corresponding to the fair copy for the next time, executing matching and automatically executing registration. CONSTITUTION:A phonetic substitute word retrieval part 8 retrieves a phonetic substitute word storage part 9 in accordance with an inputted KANA (Japanese syllabary) character string. A reading/Japanese reading dictionary retrieval part 10 retrieves the reading/Japanese reading dictionary 11 for the KANJI (Chinese character) part of the phonetic substitute word without reading so as to obtain reading. An artificial clause generation part 12 discriminates whether the reading of the obtained phonetic substitute word coincides with the inputted KANA character string or not, and generates the clause by the phonetic substitute word. A serial clause conversion candidate generation part 13 generates a serial clause conversion candidate string based on the clause generated in a clause generation part 7 and the artificial clause generation part 12. A phonetic substitute word registration part 14 discriminates the input of a phonetic substitute character, and temporarily stores the word obtained by gathering the nearby clauses including a phonetic substitute character input part in the phonetic substitute word storage part 9.
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