Information storage device and information service system

An information service system where an information storage device and an external device operated by a registered member are connected to a wide area information network, wherein:

• the information storage device comprises
• a first storage unit configured to store an arbitrary information file transmitted from the external device via a wide area information network,
• a second storage unit configured to store an information file in a predetermined form, which is derived from the information file stored in the first storage unit,
• an information file determination unit configured to determine whether or not the information file stored in the first storage unit is the information file in the predetermined form,
• a file conversion unit configured to convert the information file into the information file in the predetermined form, and
• a storage management unit configured to manage the information file stored in the first storage unit, and the information file stored in the second storage unit;
• the external device comprises
• a storage medium for storing the information file,
• an information file selection unit configured to select the information file stored on the storage medium, and
• an information file transmission unit configured to transmit the information file selected by the information file selection unit to the information storage device via the wide area information network;
• and
• if the information file determination unit determines that a copy of the information file stored in the first storage unit is not in the predetermined form when the copy is stored in the second storage unit, the storage management unit converts the copy into the information file in the predetermined form with the file conversion unit, and stores the information file in the second storage unit.