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 application data usable in a predetermined application program and 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 data read and/or data write from/to the storage device from an application program to be executed by the information processing device; in the case where the received instruction relates to the application data, 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, passing the shared data read from the storage device to the application program that issued the instruction regardless of whether the instruction is from the predetermined application program.