To attain the simultaneous transfer of a lot of data by a high transfer rate when the data are stored in an HDD(hard disk drive).

By a data control circuit 16, the AV data inputted to an AV data inputting/outputting circuit 7 are stored in a RAM 12 by way of a RAM bus 11, and next, the AV data are inputted to a parity circuit 13 by way of the RAM bus 11, and further the parity is produced by the parity circuit 13, and the produced parity is stored in the RAM 12 by way of the RAM bus 11, then the AV data and the parity stored in the RAM 12 are stored in the HDDs 6a-6e by way of the RAM bus 11 and a PCI bus 3.