An image forming system comprises an image forming apparatus and a remote operation apparatus. The image forming apparatus comprises a detection part for detecting a state change of a hardware operating member in an operation part of the image forming apparatus and a transmitting part for transmitting screen control information in accordance with the state change detected by the detection part to the remote operation apparatus. The remote operation apparatus comprises a display part for displaying a simulated image representing the detection part of the image forming apparatus, a receiving part for receiving the screen control information, and a display control part for changing a first image which is the simulated image displayed on the display part before the state change into a second image which is the simulated image in which the state change is reflected, in response to a receipt of the screen control information.