PURPOSE: To simplify device constitution and to improve the accuracy of pattern recognition by automatically registering the information of operation to correct a spot, which is erroneously recognized, as a correction rule, applying this rule to a following identified result and automatically correcting a recognition error.

CONSTITUTION: An identified result is collated with the correction rule of a correction rule storing part 52 in an error processing part 51 of the post- processing part 5 and the identified result coincident with a condition is transferred as the recognized result to an operating part 6. When the error or reject is generated in an input pattern, the operating part 6 registers the information of the recognized result as well to a history information storing part 61 together with information, which are corrected to correct category, according to an instruction from an operator correcting part 8. Each time an operator inputs the correction information from the operator correcting part 8 or the fixed instruction is given, a correction rule generation processing part 62 automatically refers the history information storing part 61 and generates the correction rule and a processed result is registered to a correction rule storing part 52.