To eliminate the need for advanced registration of a health-care professional in charge, and to preferentially call a health-care professional who recognizes the detailed situation of a patient having made a call.

A radio appliance 5 and a portable communication terminal 20 are given to a health-care professional, and a reader 6 for reading radio appliance identification information from radio appliances 5 in a readable range and a nurse call extension unit 1 are set in the vicinity of a bed of the patient. When the nurse call extension unit 1 is operated, the portable communication terminal 20 carried by the health-care professional carrying the radio appliance 5 identified by the radio appliance identification information frequently read by the reader 6 set in the bed where the nurse call extension unit 1 is set is announced. In this way, as the health-care professional carrying the radio appliance 5 whose identification information is frequently read by the reader 6 set in the vicinity of the bed is preferentially called, the health-care professional frequently visiting the bed of the patient having made the call is called.