PURPOSE: To attain the high speed restoration processing by holding the restoring time of a data base within a fixed time even when a large amount of journal files indicating the updating situation of the data base are outputted.

CONSTITUTION: This system is equipped with a task processing part which operates the update processing of the data base, and prepares a journal file 9 from the updated data, backend processing part 3 which distributes the journal file 9 to a data base restoration unit-classified file 10, and records only the latest updated data of the same physical address, and disk restoration processing part 4 which inputs a backup file 11, journal file 9, and data base restoration- classified file 10 at the time of data base restoration, and operates the restoration processing.