In an information processing system including a computer device, and a
storage device storing data used by the computer device, the region in
which the data is held is managed in association with a change, over the
passage of time in the performance and availability required of the data
holding region. The computer device includes a storage device managing
unit for managing the storage device which stores data used by the
computer device. The storage device managing unit periodically monitors
temporal characteristics information, and moves data, if the storage
region having functional characteristics corresponding to the temporal
characteristics information is different from the storage region to which
the data is currently assigned.