Since cultivation abandonment of farmland etc. is performed as the age of a farm population becomes high recently, harmful animals, such as a wild boar and a deer, breed in these farmland, and the damage to agricultural products has increased. Although the electric fence, the tin fence, and the network fence are used in order to prevent the damage to the agricultural products by the harmful animals, much a labor and cost are needed for installing these fences. In this paper, when the wild boar approached farmland, after the sensor detected the wild boar, CCD camera, the monitor for surveillance, and the alarm were operated, and the system which tells a surveillance member about approach of a wild boar was made as an experiment. Therefore, the manufacture process and the situation of operation of required hardware and software are reported.