| 摘要 |
A multicasting system, a client device, an upper router controller, a content display method, and a program are provided to solve a problem that a standby time for changing programs is not sufficiently shortened because scheduling of participation in a multicast group in an overall network is not considered. Each client device(60) includes an individual memory for storing identifiers of some of contents to be distributed by each distribution server(50) and session information regarding multicasting of the contents by associating them, and a content acquiring unit for acquiring content from each distribution server, Each distribution server includes a content distributing unit for distributing content to each client device. An upper router controller(30) includes a session information acquiring unit for acquiring session information of the content to be multicast within a reserved scheduling target period stored in each individual memory from each client device, a reserved scheduling unit for determining a priority level of a multicast address within the reserved scheduling target period, and scheduling a multicast address by each lower router during the reserved scheduling target period, and a schedule information notifying unit for notifying reserved schedule information to each client device. |
