SYSTEM FOR STORING DATA TO DATA BASE

PURPOSE:To protect the existing data despite occurrence of a processing interruption by providing a same calk key data storing means, a storage processing calk key generating means, a data storage processing means, an existing data erasion means and a calk key rewriting means. CONSTITUTION:A data storage processing means 4 defines a storage processing calk key produced by a storage processing calk key generating means 3 as a calk key and stores data into a data base 1. An existing data erasion means 5 erases the data containing the same calk key as that already stored in the base 1 after data are normally stored by the means 4. Then a calk key rewriting means 6 rewrites the storage processing calk key of the data stored newly after data are erased by the means 5 into a calk key designated by a storage request.