A database management program capable of restoring a use management book indicating allocation/non-allocation of data to individual unit storage regions, without the need to perform physical initialization at the time of reinitialization. When the database is initialized, all allocation flags provided in the use management book and indicative of allocation/non-allocation of data to the respective unit storage regions are set to a non-allocated state, and the value of an initialization counter indicative of the number of times the database has been initialized is updated. Each time data is allocated to one of the unit storage regions in the database, the allocation flag in the use management book corresponding to the data-allocated unit storage region is set to an allocated state, and the value of the initialization counter is set as an allocation-timed counter value associated with the data-allocated unit storage region.