A broadcast/multicast (BCAST) service, specifically, a BCAST service
system for transmitting broadcast contents to terminals when a network
load is small and a contents transmission method using the same are
disclosed. When contents are broadcast by using a distribution window
(DM) and a presentation window (PW), the terminals feed back a message
indicating reception confirmation of the contents to the network, such
that the contents reception success rate between the terminals and the
network can be improved.