A recording medium is provided for storing a data stream containing first error correcting codes obtained by encoding first information, second error correcting codes obtained by encoding second information, and synchronization signals. After the initial cards are provided to each of the players, determinations regarding the order in which players are to receive requested, additional cards are made using a control that communicates with terminals. Another example apparatus includes amplitude modulation of the output of the CMCD amplifiers using feedback control based, at least in part, on a comparison of an envelope of transmit coil current to an envelope of an input RF pulse. The predetermined number of frames is extracted from the designated range of the moving image data, a partial image in the set trimming areas is extracted from the extracted predetermined number of frames, and a predetermined number of continuous still images are generated.