To appropriately operate a flash memory over a possible longest period by appropriately managing rewrite of the flash memory, particularly, in a structure having an interface allowing an external storage device to be mounted.

In the structure having the flash memory 7 storing control information related to operation of the device and an extension interface 8a capable of connecting an HDD 8 as the rewritable external storage device, when installation of the HDD 8 is detected, the control information stored and managed using the flash memory 7 is switched to be stored and managed by the HDD 8 after this (Print history storage 72=expansion print history storage 82). The area of the print history storage 72 is invalidated for no further use. Storage and management of the control information related to operation of the device is performed by use of either the flash memory 7 or the HDD 8.