1. An information processing system, comprising: a storage device; and an information processing device for performing near field communication with the storage device; wherein: the storage device stores (a) application data configured for use by a predetermined application program and (b) shared data usable in an application program regardless of whether the application program is the predetermined application program; and at least one processor included in the information processing system executes: receiving an instruction regarding storage device data read and/or storage device data write from an application program to be executed by the information processing device; in the case where the received instruction relates to the application data configured for use by the predetermined application program, under the condition that the instruction is from the predetermined application program, passing the application data read from the storage device to the predetermined application program; and in the case where the received instruction relates to the shared data usable in an application program regardless of whether the application program is the predetermined application program, passing the shared data from the storage device to the application program that issued the instruction regardless of whether the instruction is from the predetermined application program.