A display system includes an image forming apparatus, and a tablet terminal transmitting/receiving information to/from image forming apparatus through wireless communication. The Image forming apparatus detects the tablet terminal, and establishes wireless communication with the detected tablet terminal through a wireless communication driver. When wireless communication is established, the image forming apparatus transmits a display request requesting display of operation information (operation manual) related to the currently ongoing operation, to the tablet terminal. Receiving the display request transmitted from the image forming apparatus, the tablet terminal displays the requested operation information (manual) of the operation manual.