A monitoring system includes a plurality of cameras and a control device. The control device includes device storage, an output device, and an input device. The device storage stores therein an image captured by each camera of the plurality of cameras. The output device displays an image exhibiting a positional relationship of the plurality of cameras. The input device sets tracking information for tracking a specific tracking target in the captured images to one camera among the plurality of cameras. When an imaginary movement line is input on the image exhibiting the positional relationship of the cameras, the input device sets the tracking information to one or more cameras corresponding to the imaginary movement line among the plurality of cameras other than the one camera.