An object of the present invention is to realize a camera system suitable for remote monitoring. The present invention is made by making improvements to a camera system that transmits camera image data to a network. The camera system includes a camera head including an image sensor and a sensor controller that controls the image sensor; a video signal processing means that performs video signal processing on image data from the image sensor; and a web server which transmits image data from the video signal processing means as the camera image data to the network, receives control data from the network, and controls at least the sensor controller or the video signal processing means.