checking whether {HEAD ~ a bookmark} is placed on {TAIL ~ a thumbnail image} of the broadcast content selected by the user, the thumbnail image being a most recent one before stopping replaying the broadcast content; and 
is placed on
checking whether { HEAD ~ a bookmark } is placed on { TAIL ~ a thumbnail image } of the broadcast content selected by the user , the thumbnail image being a most recent one before stopping replaying the broadcast content ; and
OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL 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