A first comparator makes a comparison between potentials on paired signal lines connected with the secondary winding of a transformer to produce a signal indicating whether data of a first value has been received or not. An attribute for a file is specified as having a special designation. Out of the game apparatuses participating in each scene, a parent device and a child device of the scene are determined. The inner terminals, the bond wires, the semiconductor device and the resin molding are included in the thickness of the outer terminals.