To timely send commercial information and to optimize customer's satisfaction and a distribution effect by distributing an area restricted commercial corresponding to a radio base station transmitting the commercial to prescribed targets and applying prescribed free call processing to the communication cost of a subscriber after the end of receiving the commercial.

When the subscriber of a portable telephone set 20 connecting a call through a radio base station (BTS) 16 is a subscriber corresponding to commercial service, a mobile communication switchboard (MSC) 12 connects the subscriber to a commercial sound source (CM sound source) 22 before call connection processing to allow the subscriber to listen commercial information 34. After the lapse of prescribed seconds, the MSC 12 reconnects the line of the subscriber to a normal route in order to continue normal call connection processing. In addition the MSC 12 records the execution of commercial service in a call processing memory prepared in each subscriber.