A monitoring system for surveiling an object substance includes plural movable bodies periodically patrolling surveillance areas each having a prescribed area and acquiring image data and/or audio data showing statuses during a patrol, an area local control institution installed in each of the surveillance areas for receiving from the movable bodies and storing various data including the image data and/or audio data, plural communicating devices installed in the surveillance areas for functioning as access points for building up a wireless network and a terminal device the object substance takes along or is provided with.