An image processing device includes: a communicator that executes external communication via a communication path; a hardware processor that detects a threat in the image processing device, and cuts off the communication by the communicator upon detecting the threat; a transmitter that executes communication, after the hardware processor detects the threat, to transmit a notification that the threat has been detected to a defined destination via another communication path; and a receiver that executes communication to receive communication restoration trigger information via another communication path. Once the receiver receives the communication restoration trigger information, the hardware processor executes a communication control to restore the communication by the communicator.