Data migration management apparatus and management method

A data migration management apparatus continuously monitors and stores the utilization statuses of a migration-source storage area and a migration-destination storage area, and uses the information to set up a data migration. An information management unit collects information related to the storage configuration and information related to performance from respective storage apparatuses, and stores the information in a storage unit. In a case where a data migration plan is to be set, a performance information provision unit provides, to a user computer, variations in the utilization statuses during a predetermined period for each of a migration-source volume and a migration-destination array group.