A video game apparatus, which generates, based on data obtained by a communication part via a server on a network, game data for causing a game to proceed, includes a control part converting the data obtained from the server on the network into one of a numeric value and a character code string and changing the game data based on the one of the numeric value and the character code string. The oscillating output voltage includes a pulse having a ramp slope that is determined as a function of a magnitude of the supply voltage, and is capable of being adjusted independently of the oscillation frequency. A dummy gate material layer is formed on the first interfacial material layer.