| 摘要 |
<P>PROBLEM TO BE SOLVED: To prevent momentary concentration of load on a multicast device, significant delay in withdrawal processing, and refusal of new participation processing. <P>SOLUTION: In the present invention, when a prior withdrawal request signal including a "scheduled withdrawal time" sent from a user terminal is received, information on the prior withdrawal request signal is stored in prior withdrawal information storage means, and the number of user terminals requiring withdrawal processing at the scheduled withdrawal time is calculated on the basis of the scheduled withdrawal time included in prior withdrawal request signals. And a scheduled execution time at which withdrawal processing will actually be executed on the basis of the number of the user terminals and the scheduled withdrawal time is determined, which is then stored in the prior withdrawal information storage means. At a given time, the prior withdrawal information storage means is referred to, and withdrawal processing corresponding to the scheduled execution time corresponding to the referenced time is executed. <P>COPYRIGHT: (C)2013,JPO&INPIT |
