An input device comprises a first storage section for storing game data, a first communication section for communicating with a game apparatus, a first reception control section for receiving game data from the game apparatus, a first write control section for storing the game data received from the first reception control section into the first storage section, and a first transmission control section for transmitting the game data stored in the first storage section to the game apparatus. The game apparatus comprises a second storage section for storing game data, a second communication section for communicating with the input device, a second transmission control section for transmitting the game data stored in the second storage section, a second reception control section for receiving game data from the input device, and a game process control section for executing a predetermined game process using the game data received by the second reception control section.