To provide an image display system which can display an image having the same finish state as a printed material, while making an operation easy.

An image display system 50 includes an image forming apparatus 100 and an electronic blackboard device 300 connected to the image forming apparatus 100. The image forming apparatus 100 obtains image data on a document image after receiving a print start instruction from a user, and starts print processing of the image data in a state where a printing condition being set is implemented. On the basis of the obtained image data, the image forming apparatus 100 also generates display data in which the printing condition being set is implemented and transmits the generated display data to the electronic blackboard device 300. The electronic blackboard device 300 receives the display data transmitted from the image forming apparatus 100 and displays an image indicated by the received display data.