Remote monitoring system, abnormality detection system, remote monitoring method, and program

A remote monitoring system (101) for detecting an abnormality in the state of an autonomously operating monitored object (102) is provided with: a state acquisition unit (201) for acquiring, from the monitored object (102), state information indicating the state of the monitored object (102); an information acquisition unit (202a) that acquires first sensing information indicating a sensing result of the object to be monitored (102) from an external information source (103a) that is a device that is provided outside the object to be monitored (102) and that senses the object to be monitored (102); a state estimation unit (203a) that estimates a first state of the monitored object (102) on the basis of the first sensing information; a state comparison unit (207) that compares the state information with estimated state information based on the first state; and an alarm notification unit (206) that notifies a monitor of the remote monitoring system (101) that an abnormality has occurred on the basis of the compa