A method and apparatus for processing additional data in a broadcast signal, a method and apparatus for recording a broadcast signal, and a method and apparatus for reproducing the recorded broadcast signal, which allow the normal display of additional data such as closed caption data on a screen during high-speed playback. The method includes extracting additional data from a video frame in an externally received broadcast signal, storing the extracted additional data in a transport stream generated from the broadcast signal, storing the transport stream containing the additional data, extracting the additional data from the stored transport stream according to a playback command, and separating a video signal and an audio signal from the transport stream and outputting the separate video signal and audio signal such that the extracted additional data is superimposed on the output video signal.