A method segments a compressed video by extracting audio and visual features from the compressed video. A restoration conversion state confirming unit performs confirmation such as gamut conversion state of image data read out from an optical disc and the existence or not of restoration metadata. The SIM controller sends a SIM identifier of the SIM station to the LS controller via a signal transmission path at time intervals, wherein the LS controller adds an amount of energy exchanged between the electrical power network and the load to an energy amount counter associated with the SIM identifier.