a watching system has a watching camera that takes pictures of a field to output image data . the watching system records image data in a disk recorder which records conventional broadcast program . the watching system transmits the image data to a mobile terminal . the watching system prefers an internal call to a public call . the watching system carries out a management against a danger when a suspected person is detected . the watching system changes the management according to the detected time . the watching system changes the management according to whether or not anyone is at home .