An apparatus for composite-recording information, having an optical system for forming an image corresponding to an original placed on a copy board onto a photosensitive member thereby to form an electrostatic latent image of the original, a reproducing device for scanning and reproducing electric information signals on the photosensitive member in the form of an electrostatic latent image, and a developing device for developing the electrostatic latent image on the photosensitive member in a visualized form. A system for controlling the apparatus for composite-recording information is characterized in that when there is a request for recording electric information signals while the electrostatic latent image is being formed on the photosensitive member by use of the optical system, a cycle for forming electrostatic latent image of electric information signals having high priority is executed after one page of electrostatic latent image has been formed.