On receipt of a request related to picture display from a user terminal, a central device transmits {HEAD ~ an instruction} to the plurality of distribution devices and to the plurality of receiving devices, according to {TAIL ~ a usage condition} of the transmission line and the number of simultaneously distributed pictures 
On receipt of a request related to picture display from a user terminal , a central device transmits { HEAD ~ an instruction } to the plurality of distribution devices and to the plurality of receiving devices , according to { TAIL ~ a usage condition } of the transmission line and the number of simultaneously distributed pictures
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH