An image forming device comprises: a feature detection unit for detecting features from an image created by capturing a subject viewing a display device； a parameter calculation unit for calculating the distance between the subject and the display device and the direction of the subject's face on the basis of the position of the detected features and/or the distance between detected features； an image forming unit for creating a virtual field image when the subject views the display device through an eyeglass lens on the basis of the distance between the subject and the display device and the direction of the subject's face； and a display control unit for displaying the virtual field image on the display device.
