When an external recording medium connected to an interface is removed therefrom and a new external recording medium is connected to the interface, a processor selects either first file analysis information read from a memory or second file analysis information generated based on analysis of data recorded on the new external recording medium as file analysis information to be used for decoding a file stored in the new external recording medium, and the processor makes such selection based on comparison between first recording medium management information and second recording medium management information.