a method of transmitting a basic image frame and an additional optional frame in satellite digital multimedia broadcasting , the method including : generating the basic image frame and the optional frame by encoding an image ; packetizing the basic image frame and the optional frame into a transport stream conforming to motion pictures expert group - 2 standard and assigning a packet id to the optional frame packet , the packet id being different from that of the basic image frame packet ; and generating a transport stream from the basic image frame packet and the optional frame packet having the packet id and transmitting the transport stream .