Construction is achieved that is capable of ensuring reliability of a learned value for a position of an adjustment member 24 which becomes the criterion for the transmission gear ratio control of a toroidal continuously variable transmission 4. A plurality of toner cartridges is detachably attached to the holder unit. Furthermore, in a disc-metadata updating process 212, a disc-metadata-file managing unit 182 updates the disc-metadata file, for example, using the representative-image setting unit 194. The lacing has an exposed surface comprised of an outer material that is compressible, resilient, and tactile. A signal quality of the first control frame received via the first antenna pattern and a signal quality of the second control frame received via the second antenna pattern are measured. In a specific embodiment, the characteristic of the corresponding product feature includes a shape parameter and a position parameter.