To preferably use a learning dictionary while suppressing an influence of erroneous recognition to a basic dictionary.

A teacher code (S1) is given, a character to be learned is recognition-processed only by the basic dictionary (S2) and a category different from the character to be learned is scanned (S3). Then, establishment distance (S4) is obtained by distance from a nearest and different-kind category and the learning dictionary is generated (S5). Establishment distance corresponding to the learning dictionary is stored (S6) and the basic dictionary for recognizing a character is preferably used based on establishment distance.