To accurately specify hnadwritten input information to be corrected and correct efficiently, quickly and accurately in a system for performing automatic data processing on the basis of the input information.

An input correction method obtains not only a feature quantity related to reliability of recognition processing itself of postscript information of data processing object but also feature quantity related to reliability of a variety of processing relating to the recognition processing in a preceding step of the recognition processing (S300), and calculates sub-reliability of each processing, based on each feature quantity (S320). The method specifies final reliability of notable postscript information on the basis of each sub-reliability (S304). The method specifies difficult-to-recognize information of which the reliability of the recognition processing is lower than a prescribed level by determining whether or not the final reliability is lower than the prescribed level (S306), and prompts to correct the difficult-to-recognize information by presenting recognition performance information to enhance the recognition performance of the specified difficult-to-recognize information (S308, S310).

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