| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a delivery system and the like capable of stabilizing the delivery as a whole of the delivery system in comparison to the case in which connection change is not carried out until the contents delivery is completely stopped. <P>SOLUTION: A delivery system S includes a plurality of nodes 2 which are connected in a hierarchical tree shape, delivers contents to any of the nodes 2, and detects the status of the delivery of the contents, wherein quality parameters representing decision criteria, which are the criteria for deciding whether the situation becomes wrong, are stored in node 2k. When the status becomes worse than the decision criteria while the delivery of the contents continues, an upstream-node introduction request message MG9 is transmitted to a connection destination introduction server 3, and the connection change is carried out at node 2k in response to the reply therefrom. <P>COPYRIGHT: (C)2009,JPO&INPIT</p> |
