An image processing device determines, based on an IP address received from an external device, whether any processing according to information received from the external device should be performed or not. A path of communication with the external device is examined from a network address. When the external device that is a transmission source of information is an external device outside a predetermined range, specifically, for example, when the external device is an external device connected to a communication network that is further external to the communication network connected to the image processing device, the image processing device inhibits any processing that follows an image data processing command received from the external device. The image processing device also inhibits any processing that follows a command of adjusting the image processing device which command is received from outside the predetermined range.