Patent ID: 8762773

Claim:
A processing apparatus including a data migration function from a migration source apparatus, comprising: a data copy control unit that controls a copy of data from the migration source apparatus; a unit storage area usage information calculation unit that calculates, during the copy of the data by the data copy control unit, an amount of usage of a unit storage area in a storage unit that stores the data transferred from the migration source apparatus, as unit storage area usage information; a target list generation unit that generates a target list in which the unit storage areas are ranked in accordance with the unit storage area usage information calculated by the unit storage area usage information calculation unit; a selection unit that selects the unit storage area to be verified according to the target list generated by the target list generation unit; and a comparison unit that compares data stored in the storage unit related to the unit storage area to be verified selected by the selection unit with data in the migration source apparatus related to the data to be verified.