The present invention proposes a method for network operators to control traffic between a server and a client so that client-induced traffic preemption may be prevented. The present invention comprises the processes of: an operator determining a network status, the network in which a server is streaming content via a multi-media transmission system; in accordance with the status of the network, determining whether to modify the meta data by considering a set of predetermined conditions; and transmitting to a terminal data reflecting the modification decision.