An apparatus for synchronizing audio data and visual data and a method therefor are provided. The apparatus includes a splitter, a synchronization unit coupled to the splitter, an audio control unit coupled to the splitter and the synchronization unit, and a visual data processing unit coupled to the splitter and the synchronization unit. The splitter receives an application layer data frame including audio data and visual data and splits the visual data from the audio data. The synchronization unit receives audio timing information of the audio data and acquires synchronization information according to the audio timing information and external timing information. The audio control unit receives and temporarily stores the audio data and outputs the audio data according to the synchronization information. The visual data processing unit analyzes and temporarily stores the visual data and outputs the visual data together with the audio data according to the synchronization information.