A system and method is provided of determining geographic positions. Once all disks have been rolled or all of the rings have been tossed, or both, the disk or ring closest to the marker determines which player scores points for that round. The authentication data generating unit generates authentication data used to authenticate whether the image data is altered. The light guiding member includes a light entrance portion disposed at a position offset from a rotation shaft of the agitator and allowing entrance of light into the light guiding member, and guides the light entering from the light entrance portion to an outside of the casing. If demodulatable with the DVD decoder, the laser light is switched to the red laser light and the number of recording layers is determined. No more than one of the at least two bridging devices transfers the data with any one of the at least two VNICs, and the at least two bridging devices transfer the data with the client network.