Patent ID: 8023510

Claim:
A method of efficiently dividing dynamic multicast groups, comprising: a first step of a second management server requesting a first management server to divide a group of the first management server; a second step of the first management server transmitting a list of group members to the second management server; a third step of, when the second management server requests one or more members whose group needs to be changed to join a group of the second management server because of the division of the group, the members approving the joining of the second management server and the second management server starting a multicast service; a fourth step of the second management server notifying a last server and the first management server that the members have been changed; a fifth step of the first management server deleting, from its group, the members whose group has been changed and requesting the members to secede from its group; a sixth step of the members approving the secession from the group of the first management server and transmitting acknowledge data, corresponding to the secession from the group of the first management server, to the first management server; and a seventh step of the last server transmitting contents of the change of the group, received in the fourth step, to the first management server and the second management server.