Image forming system that hands over operation from portable terminal to image forming apparatus and image formation method

An image forming system comprising:

• a portable terminal;
• and
• an image forming apparatus that allows operation of the image forming apparatus from the portable terminal;
• wherein:
• the portable terminal has a remote control processing part that transmits handing over information for handing over operation to the image forming apparatus, even though a setting is not completed, when battery residual quantity becomes less than or equal to a prescribed threshold value;
• the image forming apparatus has an operation panel that accepts operation for continuing setting operation performed with the portable terminal based on the handing over information received from the portable terminal;
• the handing over information includes setup information set up with the portable terminal and operating screen information displayed at end on the portable terminal for the setting operation, even when the setting operation of the operating screen is not completed;
• the operating screen information includes position information of a cursor on the operation screen displayed on the portable terminal for the setting operation,
• the operation panel displays a screen corresponding to the operating screen information, where the setup information is adopted, and the screen includes a cursor on a position corresponding to the position information of the cursor on the operation screen of the portable terminal;
• and
• the portable terminal has a display part that, when the battery residual quantity becomes less than or equal to the prescribed threshold value, displays a message indicating a transmission of the setup information.