Method of and apparatus for encoding/decoding multimedia data with preview function

It provides an encoding / decoding multimedia data with a preview function for a method and apparatus. Encoding multimedia data comprising a plurality of memory areas disposed in accordance with a signal play mode, according to a signal play mode of multimedia data packets to the plurality of groups, and assign the sets of multimedia data to a plurality of storage areas. Decoding multimedia data includes setting a signal play mode method, the separation corresponding to the multimedia data from the multimedia data signal to the set play mode, identifying frame data of the separated storage region, and decoding the identified frame data into the original signal.