A group control system comprises multi-combinations of image pick-up devices and an automatic assembly apparatus controlled by information from the image pick-up devices. A computer responds to demands from the image pick-up devices and the automatic assembly apparatus which independently operate with the computer. A plurality of visual information processing apparatus are provided between the interface of the computer and the image pick-up devices, for processing information therefrom, and a pulse generator is coupled to the image pick-up devices and the visual information processing apparatus, for controlling the operations thereof. The image pick-up devices are grouped into a plurality of groups each of which is coupled to each visual information processing apparatus. The plurality of visual information processing apparatuses are timed by different timing pulses from the pulse generator, whereby processing of the information from a great number of the image pick-up devices is efficiently performed by the computer.