The invention discloses a method for processing traffic information and a digital broadcast system. The method for processing traffic information data in a digital broadcast receiver comprises the following steps: receiving the traffic information data including traffic information message and system information; using prescient data to perform demodulation and channel equalization for the traffic information data; performing soft-decision decoding for the traffic information data after channel equalization; performing correction for the traffic information data after decoding; multiplexing the traffic information message and the system information from the traffic information data; using the system information to decode the traffic information message, thereby extracting the information related to at least one of the average speed and line advancing tie of traffic line, and the position information related to state information; and using the extracted information to provide traffic information service for users.