Communication apparatus, communication system, communication control method, and {TAIL ~ recording medium} storing {HEAD ~ communication control program} 
Communication apparatus , communication system , communication control method , and { TAIL ~ recording medium } storing { HEAD ~ communication control program }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD