When in receiving a call sign to identify the radio station RS being received now from a client terminal CT and transmitting state information that shows the state of an information provision service about the radio station RS corresponding to the call sign to the above client terminal CT, if at least the information provision service is available, a URL corresponding to the above information provision service is transmitted to the client terminal CT together with the state information. Thereby, the URL corresponding to the above information provision service can be provided to the client terminal CT together with the state information showing the state of the information provision service about the radio station RS. It enables the user to clearly recognize the service state of the above information provision service in a step before accessing the information provision service.