The experimental system which can provide a supplemental CG images using TVML (TV-program Making Language) has been developed. Rich CG contents were displayed at the second screen using a limited bandwidth of data-broadcasting. Moreover, the synchronization between terminals was performed by capturing a caption data, and CG model and the data of a set were obtained from the communication channel, and terms and conditions required for real-time CG images were examined. As a result of examination, since data efficiency was good and rich CG contents were displayed at the second screen in real time.