Method and apparatus for transmitting additional data in digital terrestrial broadcasting system

An apparatus for transmitting additional data in a digital terrestrial broadcasting system, the apparatus comprising:

• a main signal generating unit configured for performing channel-coding main data and converting the main data into a main signal;
• an additional signal generating unit configured for performing channel-coding additional data and converting the additional data into an additional signal;
• a mixed signal generating unit configured for generating a mixed signal by combining the main signal and the additional signal;
• and
• a mixed signal transmitting unit configured for modulating the mixed signal and transmitting the modulated mixed signal to a receiver through a transmission antenna,
• wherein information on a transmitter of the apparatus for transmitting additional data is additionally transmitted,
• wherein the additional data is additional data requested by the receiver, and
• wherein a unique number of the receiver and an identification number of a transmitter transmitting broadcasting to a broadcasting area including a place at which the receiver is positioned are transmitted by the receiver together with the request for the additional data.