displayed area information representing a displayed area of the second video in the first video when the second video is switched to displaying at the time, and designate a position in the first video in which the second video is displayed when the second video is displayed at the arbitrary point of {HEAD ~ time} based on {TAIL ~ the metadata}; and 
based on
displayed area information representing a displayed area of the second video in the first video when the second video is switched to displaying at the time , and designate a position in the first video in which the second video is displayed when the second video is displayed at the arbitrary point of { HEAD ~ time } based on { TAIL ~ the metadata } ; and
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH