A computer program according allows a processor to function such that a first stream of a first data type including a motion, a sound, a comment, or information according to gifting is retrieved, a second stream of a second data type including a video is retrieved, data according to the first stream and data according to the second stream are synthesized, and the synthesized data is provided. In addition, the first data type includes intermediate information according to the video. In addition, the intermediate information includes depth information according to the video.