To achieve operation during call from each terminal without mounting a common protocol to each terminal having a different protocol in multi-point conference communication for accommodating a terminal having the different protocol.

An SIP-MCU connecting apparatus 100 comprises an SIP terminal termination control unit 2 connected to an SIP terminal using an SIP protocol; a 3G-324M terminal termination section 3 that is connected to a 3G-324M terminal using a 3G-324M protocol, and inputs a PB signal for requesting the transmission of prescribed information to the SIP terminal from the 3G-324M terminal; and an information output section 70 that detects the PB signal entered by the 3G-324M terminal termination section 3, and outputs the prescribed information requested to be transmitted to the SIP terminal to the SIP terminal termination control unit 2 based on the detected PB signal. The SIP terminal termination control unit 2 inputs the prescribed information outputted by the information output section 70, and transmits the prescribed entered information to the SIP terminal by using the SIP protocol.