Abstract: When a service receiving server 1 receives a request of a multi-point communication service from communication terminals 3A to 3C, a service ID corresponding to the multi-point communication service and passwords are respectively sent to the communication terminals 3A to 3C receiving the multi-point communication service and are sent to a communication service unit 2. When the communication service unit 2 receives the service ID and the password from the communication terminals 3A to 3C, the communication service unit 2 collates whether or not the service ID and the password sent from the communication terminals 3A to 3C agree with those sent from the service receiving server 1. In case of the agreement, the communication service unit 2 connects with the group of communication terminals 3A to 3C and provides the multi-point communication service for the communication terminals 3A to 3C according to the service ID.

Abstract: A communication service unit 1 connected with a plurality of communication terminals 3 sends additive information stored in an additive information storing unit 2 before the sending of communication information including visual data, audio data and/or text data sent for an original purpose of communication, while temporarily stopping the sending of the communication information during the communication based on the communication information, or after the completion of the sending of the communication information. Or, a transmission band permitted for the communication information is narrowed in the communication service unit 1 or an instruction is sent from the communication service unit 1 to one communication terminal 3 of a sending end to decrease a transfer rate of the communication information temporarily or from beginning to end of the communication, and the additive information is sent within a transmission band preset for the communication information.

Abstract: When a service receiving server 1 receives a request of a multi-point communication service from communication terminals 3A to 3C, a service ID corresponding to the multi-point communication service and passwords are respectively sent to the communication terminals 3A to 3C receiving the multi-point communication service and are sent to a communication service unit 2. When the communication service unit 2 receives the service ID and the password from the communication terminals 3A to 3C, the communication service unit 2 collates whether or not the service ID and the password sent from the communication terminals 3A to 3C agree with those sent from the service receiving server 1. In case of the agreement, the communication service unit 2 connects with the group of communication terminals 3A to 3C and provides the multi-point communication service for the communication terminals 3A to 3C according to the service ID.