To change information without requiring much labor and time when changing the information commonly printed between two or more kinds of business forms.

The data commonly registered in two or more business form data holders 10-1 to 10-n are registered in a shared part database 20 in conformation to identification information capable of identifying the business form data holders 10-1 to 10-n. When data to be changed are selected, and data for correction are designated, the data to be changed are retrieved in a shared part data retrieval part 40, and the data retrieved in the shared part data retrieval part 40 are changed to the designated data in a shared part data updating part 50, and registered in a shared part database 20. The data registered in a business form data holder identified by the identification information conformed to the data retrieved in the shared part data retrieval part 40 are changed to the designated data.