Abstract: A system for monitoring a plurality of video signals in an internal video network, such as a broadcast recording environment, or security camera network, is described. The system comprises a picture monitor 2 having a screen 6 on which a mosaic video image containing the video signals from a plurality of cameras 28 or other video devices is displayed. Selection of a video signal from the mosaic image can be performed to display a full screen version of that signal. Preferably, at the transmission stage 20 of the network, only the mosaic video image is transmitted. By not transmitting the individual video signals separately, a large saving can be made on the band width required for the transmission as well as on the cost of the encoding components at the transmitter.