PURPOSE:To smoothly input sentences from a sentence input device by automatically performing the conversion between the year expressed with the Christian era and the year expressed with the name of an era. CONSTITUTION:Kana (Japanese syllabary) character strings and numeric strings inputted from an input means 1 are subjected to KANA-KANJI (Chinese character) conversion by a KANA-KANJI converting means 3 and are displayed on a display means 2. A means 4 for conversion between the Christian era and the name of an era refers to a dictionary 5 of correspondence between the Christian era and names of eras to automatically convert the year expressed by the Christian era to the year expressed with the name of an era or convert the year expressed with the name of an era to the year expressed with the Christian era based on the indication from the input means 1.
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