To automatically delete font data and graphic data for use in the issue of gold notes and the like from a printer after a lapse of a predetermined time.

The registration data such as the font data and the graphic data for use in the printing of gold notes and the like are downloaded together with data indicating a storage period (a period of validity) from a host computer 200 and stored in a flash memory 105. The downloaded date and hour indicated by a calendar function part 104, the period of validity, and a name of the registration data are stored in the flash memory 105 as a record of a registration data table and the registration data passing the period of the validity from the downloaded time are deleted from the flash memory 105 by the control of a CPU 101.