Patent ID: 7808668

Claim:
An image forming system comprising: an image forming apparatus that forms an image on a recording material; and a user interface device connected to the image forming apparatus, the user interface device that accepts a user's input, outputs the input to the image forming apparatus and displays information based on data input from the image forming apparatus, wherein: the image forming apparatus sends a notification to the user interface device before the image forming apparatus executes a process of changing one operation mode to another operation mode, the process including disconnecting communication between the image forming apparatus and the user interface device, and the user interface device displays information corresponding to the notification received from the image forming apparatus, wherein the process includes changing from a normal mode to a power-saving mode; and wherein when the user interface device receives from the image forming apparatus the notification indicating that the image forming apparatus will execute the process of changing and then the user interface device does not establish the communication with the image forming apparatus after a predetermined time elapses since the receiving of the notification, the user interface device displays that anomaly occurs in the image forming apparatus or in the communication between the user interface device and the image forming apparatus.