To provide a data management method capable of reducing time for processing such as registering, adding, and updating of data while using FAST structure by which high speed retrieving is possible.

The data management program 21 includes an input receiving function 21a receiving input of original data of a table form including a plurality of records having item values for a plurality of items, a compiling function 21b for storing the items of the input original data used for a key for data processing by splitting them into an item value table which is an arrangement wherein the unique item values are sorted and an index value table which is an arrangement wherein a position in the item value table storing the item values of the records in order of arrangement of the records is recorded, and a table form storing function 21c for storing the items of the input original data not used as the key for data processing as the data in the table form including a plurality of the items in one record.