The purpose of the present invention is to appropriately select a virtual execution unit to be shut down. A storage unit (11) stores, for each virtual execution unit (21, 22), both resource information (13) which indicates a first usage amount relating to processor resources and a second usage amount relating to other resources, and service information (14) which indicates usage of a service (23). A control unit (12) identifies a virtual execution unit that can be shut down, on the basis of predetermined criteria. The predetermined criteria indicate either: a virtual execution unit in a first state (15), that is, a virtual execution unit for which both an amount of change in the first usage amount and an amount of change in the second usage amount are equal to or less than a threshold value, and which has not used the service (23) for at least a first period of time; or a virtual execution unit in a second state (16), that is, a virtual execution unit for which an amount of change in the second usage amount is equal to or less than a threshold value, and which has been using the service (23) by polling the service (23) for at least a second period of time, during which other virtual execution units were also polling the service (23).
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