System and method for controlling transport rate of real time streaming service

A streaming system comprising:

• a server connected to a network, the server streaming multimedia contents in real time by dividing and transporting the multimedia contents at a transport rate
• a client including a buffer, the client transmitting to the server at an interval a buffer level indicating a quantity of the multimedia contents which was transmitted to the client and stored in the buffer, wherein the server changes the transport rate where a difference between the transmitted buffer level and a required buffer level is compensated using an accumulated average value for a period of time, wherein the client completes the transmission of the multimedia contents;
• wherein the server begins transmission of the multimedia contents at a maximum transport rate allowed by the network, maintains the maximum transport rate until the buffer level received from the client at an interval reaches the required buffer level for a first time, and changes the buffer level to a pre-set transport rate and transmits the multimedia contents for reproduction if the received buffer level reaches the required buffer level;
• and
• wherein the accumulated average value is calculated where a difference between the buffer level received for the period of time and the required buffer level is multiplied by a weight factor, added up and averaged, and a difference relative to the most recently received buffer level is multiplied by a higher weight factor.