A data center includes an individual storage unit having storage areas for
respective user apparatuses, a shared storage unit having a storage area
for sharing by the user apparatuses, a unit configured to store data
received from an external node in one of the individual storage unit and
the shared storage unit that is selected according to predetermined
criteria, a unit configured to generate a data arrangement list according
to statistics of the received data and predetermined cache data
arrangement conditions, and a unit configured to transmit an instruction
signal to at least one of the shared storage unit and the individual
storage unit according to the data arrangement list to cause data stored
in the at least one of the shared storage unit and the individual storage
unit to be transferred to a cache server provided on a core network or on
a radio access network.