1. A method of manipulating a media object in a media player, the method comprising: generating a rendering map for managing a region of the media object in a rendering interface according to time and based on scene description information; receiving a user input via the rendering interface; updating the rendering map based on the user input; re-composing a scene based on the updated rendering map; and rendering the media object according to the re-composed scene, wherein the region of the media object comprises information about a region in which the media object exists, and wherein the generating the rendering map comprises: determining if the region information exists in the scene description information, extracting the region information from the scene description information when the region information exists in the scene description information, and using a value pre-determined by a user for the region information or a value determined by an internal algorithm when the region information does not exist in the scene description information.