The apparatus (3, 11) comprises a first input part (5, 43) which inputs first utilization state information that indicates information relating to the utilization state of first shared data in the respective first data control devices, a second input part (5, 43) which inputs second utilization state information that indicates information relating to the utilization state of second shared data in the respective second data control devices, and a selection part (5, 43) which compares the input first utilization state information and second utilization state information to each other, selects the data among the first shared data or the second shared data, that is to be used as the migration object data on the basis of the results of this comparison, selects the data migration destination from the one or more first data control devices or the plurality of second data control devices, and outputs information relating to the selection results.