Provided is an abnormality detection system for detecting area abnormality along railroad lines quickly and with a high degree of precision using existing field equipment and an equipment abnormality detection system, comprising: the equipment abnormality detection system connected to a plurality of field equipment via a network; an area abnormality detection system for detecting an area abnormality which is an abnormal event affecting behaviors of the plurality of field equipment; a database; and an alarm device. The equipment abnormality detection system, upon detecting the occurrence of an abnormality in field equipment, transmits information regarding the occurrence of the abnormality to the area abnormality detection system, and the area abnormality detection system records the received abnormality occurrence information in an abnormality occurrence log in the database. Also, when abnormality occurrence information pertaining to a first field equipment among the plurality of field equipment is received f
