An optical disc apparatus for shortening time necessary for adjustment while maintaining an accuracy of a result of adjustment, determines \u201cA\u201d pieces of recording layers, upon arrangement of the recording layers of an optical disc having \u201cN\u201d pieces of recording layers. The system includes one or more wireless access points, wherein each wireless access point is operable to detect signal of a UE in the wireless communication network, and to train with the UE to establish a communication link with the UE. Thermoelectric-voltage-versus-time data of the electric circuit is acquired.