1. A surveillance system provided with multi-camera including at least a rotating camera controllable for panning, tilting and zooming in and out; intruding object recognizing means for recognizing a state of an object of monitoring by analyzing image signals entered from said multi-camera; camera function determining means for allocating, according to the state of said object of monitoring, to a first camera a tracking function whose field of view is a predetermined direction of said object of monitoring and to a second camera a wide angle shooting function of shooting a monitored space in a wide angle; and camera control means for controlling said multi-camera according to the allocation of functions by the camera function determining means.