An ignition plug that promotes expansion of flame and enhances spark corrosion resistance, said plug includes a center electrode; a tubular insulator holding the center electrode; a tubular metallic shell holding the insulator; and a ground electrode having a bent portion and a facing end surface. Further, the second gate electrode overlaps the first active layer to form a first channel region, and the first channel region is formed inside one of the grains. The mobile station further includes a privacy engine, a script engine and a communication manager.