Abstract: One or more storage devices store resource migration schedule information including a plurality of records. Each of the plurality of records indicating a migration source node and a migration destination node of each of one or more resources. One or more processors are configured to determine a priority of each of the plurality of records such that a record having locality after migration has a higher priority than a priority of a record without locality after migration. The locality is determined based on whether a virtual machine and a volume associated with each other in advance exist in the same node. The one or more processors are configured to determine a migration schedule of each of the plurality of records based on the priority of each of the plurality of records.