The disclosed embodiments relate to a multimedia data encoding/decoding method and apparatus. In some aspects, a decoding method comprises receiving multimedia data which comprises a media area including a video data area having a plurality of video contents and an audio data area having a plurality of audio contents, a media information area including a plurality of video track areas respectively corresponding to the video contents and a plurality of audio track areas respectively corresponding to the audio contents, and a menu description area including description data for displaying a menu that provides an interface between a user and media data in the media area; displaying a menu using the description data; and decoding media data extracted from the media area based on the menu, wherein each of the video track areas and the audio track areas comprises at least one of temporal information and spatial information of a corresponding content, and the media area, the media information area and the menu description area are incorporated into a single file. The disclosed embodiments include a multimedia data encoding/decoding method and apparatus can construct a multi media data file including a plurality of video/audio contents and description data for a menu between a user and media data. Thus, a time taken to process and transmit the multimedia data can be reduced.