an external input unit configured to input a signal of {HEAD ~ contents} including {TAIL ~ an image} from said second wearable display, said second wearable display being of a second user, 
including
an external input unit configured to input a signal of { HEAD ~ contents } including { TAIL ~ an image } from said second wearable display , said second wearable display being of a second user ,
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH