This game machine system includes a set top box 51 as a receiving unit for receiving digital data distributed using a broadcast system or a communication system. An internal memory stores cartographic data, for displaying the cartographic data on a display of the navigation device. A method of providing several different modes of OTDR measurement through external control is also disclosed. With a progress of screwing therein, each of the female screw portions is elevated and the cylindrical gel is pulled and elongated. Mirrors may be formed on free ends of cantilevers to form optical scanners.