PURPOSE: To generate a program conforming to a user's request without increas ing the number of programs.

CONSTITUTION: A storage device 12 for storing program parts 124 for generating a pattern of various business forms and a program conforming to a user's request is provided, and at the time of generating the program conforming to the user's request 11, a user's desired pattern in the patterns of various business forms is retrieved, change information to this retrieved pattern is inputted, and in accordance with this change information, a correction to the desired pattern retrieved by the user is executed, and the program for processing its corrected business form format and the business form consisting of a business form item is generated by using the program parts 124.