A control device to control an image forming system having an image forming apparatus and a sheet discharge apparatus and includes a storage, a generator, and a controller. The storage stores sheet stacking information and taking out completion information. The generator generates a sheet bundle image representing a sheet bundle stacked on each of plural stacking trays based on the stored sheet stacking information. The controller combines the sheet bundle image with a system configuration image to display a combination on a display. The controller filters, from a list of processed image forming jobs, an image forming job for which sheets are not taken out to display the filtered image forming job on the display, and updates the sheet stacking information and the taking out completion information where the controller controls to determine that the sheet bundle stacked on any one of the plural stacking trays is taken out.