| 摘要 |
An SIP server determines whether the number of increased audiences is a switching from unicast to multicast“(U2M) threshold value”, stored in a connection threshold value storing unit, or more in a case where a viewing request is received from a viewing device and determines whether the number of decreased audiences is less than an“M2U threshold value”when a viewing end is received from a viewing device. As a result, multicast transmission is controlled to be performed in a case where the number of delivery requests is determined to be the“U2M threshold value”or more, and unicast transmission is controlled to be performed in a case where the number of delivery requests is less than the“M2U threshold value”.
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