A client apparatus for utilizing services by executing service programs includes a policy holding unit, a verification unit, a verification result holding unit, and a verification result notification unit. The policy holding unit holds a service-specific verification policy pre-checked by a device verification apparatus. The verification unit verifies an operation and configuration of the client apparatus itself by using the verification policy when the service program is executed. The verification result notification unit notifies the verification result to the device verification apparatus, which requests the verification result.