A game device includes: a detecting section configured to obtain an imaged image imaged by an imaging device, and detect a tracking object included in the obtained imaged image; a control section configured to calculate a position in which to display a predetermined image according to a position in which the tracking object is detected; and an image generating section configured to generate a display image displaying the predetermined image in the position calculated by the control section in the imaged image such that the predetermined image is superimposed on the imaged image, and display the generated display image on a display device.