Load information acquisition unit (230) defines the load information based on the history processing history acquisition unit (220) is obtained. Test period determination unit (240) defines a test period based on the load information. Test period is a period for using the testing policy. Testing policy is a policy of testing of the control policy to be used in an information processing system (100). The system controller (260), by using the test policies instead of the actual usage policies that are actually used in the test period, and tested in a real use environment information processing system (100) testing policy, in the test policy I is measured as a test result the processing capacity information processing system (100). Within the test result meets the criteria, the policy change unit (270) changes on the basis of the testing policy actual usage policy.
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