PURPOSE: To provide a character string correcting device which is capable of easily and properly correcting the same corresponded candidates including plural ones, in data outputted from an original reader, etc.

CONSTITUTION: The image data of an original are read (S1), and the recognition candidate and correction candidate corresponding to each word are determined through a character recognition processing (S2 to S4). The recognition candidate selects a proper corrected character string among the correction candidate (S10) or inputs a new corrected character string (S11). When the corrected character string is newly inputted, the input character string is added to the corrected recognition candidate for other word where the character string which is equivalent to the corrected recognition candidate is defined as the recognition candidate or the correction candidate (S12, S13).