Apparatus and method for transmitting/receiving data in communication system

PURPOSE: A data transceiving apparatus of a communication system is provided to transceiver broadcasting data corresponding to the broadcast service by combining additional data with main data. CONSTITUTION: A main data generator(102) creates main data corresponding to a main broadcasting service. A main signal generator(104) creates the main signal of the main data. An additional data generator(110) creates a plurality of additional data corresponding to additional services. An additional signal generator(112) generates a plurality of additional signals of the additional data. A combination unit(106) unites the main signal and the additional signals. A transmitting unit(108) transmits broadcast signal.