To make PDA(personal digital assistance) function as an entertaining game machine.

The existing memory card 1 is provided with an tilt sensor 23. The PDA with the memory card 1 mounted thereon is inclined longitudinally and the tilt sensor 23 detects the angle of the tilting thereof to be outputted to an A/D conversion part 24. The A/D conversion part 24 converts the angle of the tilting to a digital data to be supplied to a signal control part 21. The signal control part 21 controls the tilting data to a communication format with the PDA mounted and an output thereof is sent to the PDA through an input/ output interface 25. As a result, the PDA controls the display of a game screen based on the tilting data supplied from the memory card 1. In other words, this makes the PDA function as a more entertaining game machine for users who fail to advance their games as inputted on keys.