According to an embodiment, an area monitoring system includes a sensor device installed at a position where a monitoring target area can be imaged, an analyzer configured to analyze an image captured by the sensor device, a manager configured to manage a situation of the monitoring target area on the basis of an analysis result of the analyzer, and a provider configured to provide information about the monitoring target area. The manager causes the provider to provide information for promoting maintenance regarding at least one of the monitoring target area or the sensor device when a degree of deviation between a state of a road included in the image and a state of the road based on a predetermined reference image of the sensor device is greater than or equal to a threshold value.