Upon receipt of an access request from a Web terminal, a service providing server transmits a shop ID stored in an external information database to the Web terminal. When the shop ID is selected by the Web terminal, the service providing server acquires external connection destination information, and notifies a SIP proxy server of the information via the Web terminal. When notified of the information, the SIP proxy server identifies internal connection destination information in an internal information database, based on an IP address added at the time of the notification of the external connection destination information. After making a call to a telephone device with the use of the identified internal connection destination information, the SIP proxy server makes a call to the shop with the use of the external connection destination information. After that, the SIP proxy server establishes a connection between the telephone device and the shop.