An image display system includes an image display apparatus and a shutter device. The image display apparatus includes an image display section, a sync signal sending section which sends a sync signal for synchronizing display timings of the left-eye image and the right-eye image with the shutter device to the shutter device, and a protocol sending section which sends protocol information to the shutter device. The shutter device include a shutter section which transmits the left-eye image and the right-eye image, a shutter drive section which analyzes the sync signal received through a sync signal receiving section using the protocol information stored in a protocol storing section and drives the shutter section on the basis of the analysis result, and a protocol updating section which updates the protocol information stored in the protocol storing section.