PURPOSE: To correct the visual shift between the input coordinates and the display coordinates in order, to prevent the input mistakes and to improve the operability with an information processor by providing a correction information deciding circuit incorporating a coordinate comparison means, a mean value calculation means, etc., a correction information storing area, etc.

CONSTITUTION: The classification of an input key is decided by a process deciding circuit 2 for the data received from an input device 1. Then a correction condition deciding screen is displayed on a display device 10 with the input of a correction condition key. When a pattern is inputted via a touch panel 6 by a user, the coordinate information for pattern display is compared with the coordinate information obtained at the input via the coordinate comparator of a correction information deciding circuit 3. Then the difference information is stored in both horizontal and vertical difference information storing areas of the circuit 3. The mean value calculation circuit of the circuit 3 calculates the mean difference value between the coordinate values of difference information on both storing areas. The mean difference value is stored in a correction information storing area 4 as the correction information. Thus it is possible to correct the visual shift between the input coordinates and the display coordinates and to prevent the input mistakes. Furthermore a displayed specific pattern can be automatically corrected only by tracing it previously.