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