1. A metadata editing apparatus comprising: a scene division unit for dividing multimedia content containing at least one of moving pictures and audio into a plurality of scenes to generate scene section information metadata indicating a scene start position and a scene end position for each scene obtained as a result of the division; a thumbnail image generation unit for extracting a representative frame of each scene as a thumbnail image based on corresponding scene section information metadata sent from the scene division unit and generating thumbnail image information metadata describing position of the thumbnail image in the multimedia content; a scene description edit unit for performing hierarchical editing of each scene of the multimedia content based on the scene section information metadata sent from the scene division unit and generating scene structure information metadata describing a hierarchical structure of the multimedia content; and a metadata description unit for integrating the scene section information metadata thumbnail image information metadata, and the scene structure information metadata and generating metadata describing contents and a structure of the multimedia content in accordance with a predetermined format.