if it is checked that the bookmark is placed on the most recent thumbnail image, replaying the broadcast content successively from the thumbnail image of {HEAD ~ the broadcast content} selected by {TAIL ~ the user} 
selected by
if it is checked that the bookmark is placed on the most recent thumbnail image , replaying the broadcast content successively from the thumbnail image of { HEAD ~ the broadcast content } selected by { TAIL ~ the user }
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 HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL