The service description metadata authoring module inputs data for contents sharing service and can play, pause, stop and control A/V position using scroll bar. It is easy to get the video bookmark data at any random position using this kind of control function. The video bookmark metadata authoring module includes thumbnail image generation, program ID, position, title and tag input function at specific AN position. When a video bookmark metadata is generated, a video bookmark ID is also generated and then used for contents sharing service.