By considering a device life and time needed for data migration, data stored in a storage apparatus is securely preserved until a retention term of each of the data. Multiple disk devices 40A to 40C that store a data file generated by a service server apparatus 30 are included. A migration manager 11 of a management server apparatus 10 acquires preservation period information that indicates a preservation period of the data file from the service server apparatus 30, and calculates a preservation term of the data file based on the preservation period information. The migration manager 11 of the management server apparatus 10 also acquires data amount information of the data file from the service server apparatus 30, and calculates a necessary time needed for migrating the data file to other disk devices A40A to 40C. When the preservation term comes later than an operation guarantee term recorded in advance for each of the disk devices 40A to 40C, the migration manager 11 of the management server apparatus 10 compares the end of the migration with the operation guarantee term, and determines the necessity of the migration.