Multicast control device, multicast control method, and non-transitory computer readable medium

A multicast control method comprising:

• determining whether the number of communication terminals that have joined a multicast service exceeds a predetermined threshold;
• and
• starting a multicast session for a plurality of communication terminals that have joined the multicast service when it is determined that the number of communication terminals that have joined the multicast service exceeds the predetermined threshold
• wherein, when it is determined that the number of communication terminals that have joined the multicast service does not exceed the predetermined threshold, starting at a specified timing a multicast session for at least one communication terminal that has joined the multicast service, and
• wherein,
• an interval between the times of joining of communication terminals to the multicast service in the past is calculated, and
• the specified timing is after a lapse of the calculated interval from the time of joining of the last communication terminal to the multicast service.

A non-transitory computer readable medium storing a program causing a computer to perform:

• determining whether the number of communication terminals that have joined a multicast service exceeds a predetermined threshold;
• and
• starting a multicast session for a plurality of communication terminals that have joined the multicast service when it is determined that the number of communication terminals that have the multicast service exceeds the predetermined threshold
• wherein, when it is determined that the number of communication terminals that have joined the multicast service does not exceed the predetermined threshold, starting at a specified timing a multicast session for at least one communication terminal that has joined the multicast service, and
• wherein,
• an interval between the times of joining of communication terminals to the multicast service in the past is calculated, and
• the specified timing is after a lapse of the calculated interval from the time of joining of the last communication terminal to the multicast service.