In an OFF condition of an ECO switch, a stop decision reference value Wstop is set to a value W1. The computer system receives an indication that a service is to be hosted using the online service, where the indication includes a service configured for hosting by the online service and a portion of use information indicating how the service delivery platform components are to be used to host the service for various computer clients. In particular, a body that encloses one or more external orifices of the subject provides a resistance differential between inhaled gas flows and exhaled gas flows that supports the subject’s airway. If a termination detection section detects termination of a call, then if music is being played back, then the playback is stopped temporarily, and a first control section supplies a ringing tone only to the first earphone and enables telephone conversation by means of the first earphone and the microphone.