There is provided an amplifier that measures a display delay time caused until a video is displayed actually after a video signal is generated, and sets automatically a delay time of an audio signal such that an audio synchronizes with this display. The method performs an oxidation process simultaneously on the wires to form a first gate oxide on the first wire and a second gate oxide on the second wire. 1\u2266t<R; and 7R\u2266n, wherein R represents a volume average particle diameter of the fine particles; t represents a thickness of the non-laminate layer; and n represents the number of the fine particles contained in the non-laminate layer per 10,000 square \u03bcm in the substrate plane direction 2).