In the present invention, {HEAD ~ the place} of occurrence of abnormality is estimated from {TAIL ~ the momentary positions} of moving objects and the moving directions of these objects 
In the present invention , { HEAD ~ the place } of occurrence of abnormality is estimated from { TAIL ~ the momentary positions } of moving objects and the moving directions of these objects
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH