PURPOSE: To improve the efficiency of sentence preparation by simplifying a correcting procedure for a KANA (Japane syllabary)/KANJI (Chinese character) conversion result, in respect to input based upon hand-written character recognition and KANA/KANJI conversion.

CONSTITUTION: This sentence input device is provided with a character string input means 1, an input buffer 2 for temporarily storing an inputted character string including an abbreviation code, a KANA/KANJI conversion means 4 for executing KANA/KANJI conversion for the character string stored in the buffer 2, a conversion result buffer 5 for storing a KANA/KANJI conversion result, an instruction input means 6 for inputting a correcting instruction for the KANA/KANJI conversion result, and a character position transforming means 8 for a specified position on the conversion result into a position in the inputted character string at the time of inputting a change instruction for a segmenting position of a word or a clause from the means 6.