PURPOSE: To improve the register efficiency of a word dictionary file by registering a minimally necessary word in the word dictionary file since there are problems such as register repetition or the register omission of the word which should be registered in the register processing of the character-recognized word.

CONSTITUTION: A word selection processing part 2 displays the word which is character-recognized and decided by a specified method in a display device 4, reads the specified word from the display device 4 by an input command and informs a word register processing part 3 of the word. The word register processing part 3 is constituted to retrieve the word dictionary file 5 with the word as a key and to register the word in the word dictionary file 5 unless the word is registered.