A computer system includes: a storage device; storage area management units that provide a storage area, based on the storage device to a data management unit having a data protection function for achieving availability of a system providing a service, and have a data control function for the storage area; and a control unit that manages arrangement of the storage area and a data control policy applied to the storage area. The control unit acquires setting information about the availability of the system providing the service and performance of the service and determines the data control policy applied to the storage area, based on the setting information. The storage area management units control the storage area, based on the data control policy.