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.