{HEAD ~ A video synthesizing apparatus} configured to receive a first video and {TAIL ~ a second video} and output the first video synthesized with the second video, wherein, 
{ HEAD ~ A video synthesizing apparatus } configured to receive a first video and { TAIL ~ a second video } and output the first video synthesized with the second video , wherein ,
HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH