A determination unit determines whether or not an image forming device is a pre-designated image forming device by using specifying information when security setting including the specifying information that specifies the pre-designated image forming device has been made in image data read from a portable external storage device. A display control unit causes a display unit to display image information specifying the image formed on the basis of the image data in a state in which security of the contents of the image is ensured when the image forming device is not determined by the determination unit to be the pre-designated image forming device, and causes the display unit to display the image information in a state in which security of the contents of the image is not ensured when the image forming device is determined by the determination unit to be the pre-designated image forming device.