Communication is performed between a wearable camera and a vehicle-mounted recorder, the wearable camera captures an image of a capturing area, and the vehicle-mounted camera captures an image of the capturing area. The vehicle-mounted recorder records first image data of the capturing area captured by the vehicle-mounted camera according to a recording start request from the wearable camera, and transmits a recording start instruction to the wearable camera simultaneously with the recording. The wearable camera starts the recording of second image data of the capturing area captured by the wearable camera after the recording start instruction is received.