Patent ID: 7990562

Claim:
A data processing device comprising: a storing unit that stores various types of data, the storing unit being capable of being recognized, as an external storage device, by an external personal computer; a print execution unit; and an interface that: is structured to be connected to both the external personal computer and the print execution unit; interfaces the print execution unit with the storing unit such that the print execution unit can read and write various types of data; and when the external personal computer is connected to the interface, interfaces the external personal computer with the storing unit such that the external personal computer can read and write the various types of data from and to the storing unit without being recognized by the print execution unit, wherein the print execution unit, after print instruction data is stored in the storing unit via the interface by the external personal computer without being recognized by the print execution unit, automatically reads the stored print instruction data from the storing unit via the interface, and performs printing based on the print instruction data.