PROBLEM TO BE SOLVED: To perform capture notification accurately.SOLUTION: A server device 10 receives oscillation information of a trap which is detected by a sensor device for detecting oscillation of the trap and is regularly transmitted by the sensor device. The server device 10 further outputs information which can identify a trap whose oscillation is detected by the sensor device when it is determined, on the basis of the oscillation information which is regularly received, that the sensor device has been detecting oscillation that is larger than a prescribed value for a longer period than a prescribed period.