A decoding device and a decoding method in a digital broadcast receiver are provided, in which received packet data is demultiplexed into video data and audio data, and decoding control signals of the respective data are extracted. An Estimated Program Clock Reference (EPCR) is generated from the decoding control signal of the audio data, and the EPCR is compared with the decoding control signal of the video data to generate a video decoding control signal. The demultiplexed video data is decoded in synchronous with the video decoding control signal, and then the decoded video data is outputted. The demultiplexed audio data is decoded in synchronous with the audio decoding control signal, and then the decoded audio data is outputted. Finally, the decoded video data and the decoded audio data are displayed and reproduced.