The information processing system 1, wherein {HEAD ~ the switching hub} of the line concentrator apparatus transmits to {TAIL ~ the external network} the information received from the first external device regarding a processing status of the first external device 
The information processing system 1 , wherein { HEAD ~ the switching hub } of the line concentrator apparatus transmits to { TAIL ~ the external network } the information received from the first external device regarding a processing status of the first external device
OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD 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 OTH OTH OTH OTH OTH OTH