Time stamps are attached to packets output from stream data input section by a time stamp-attaching section in a HDD, and the packets are then recorded into a HDD main unit. A stream data-generating section removes the time stamps from the packets subsequent to a predetermined amount of packets last recorded into the HDD main unit and controls the timing of the packets according to the time stamps, and the packets are transferred to an HDD. In the HDD, time stamps start to be generated according to the last predetermined amount of packets, and to the packets transferred thereafter, time stamps are attached in a similar fashion as in the HDD, so that the packets are recorded into the HDD main unit.