Display device, image data generating device, image data generating program, and display method

According to one embodiment, a display device (10) includes an image data generating unit (130) and a display unit (540). The image data generating unit (130) generates image data on an image (187). The display unit (540) presents a video including the image data to an image viewer (100) on a moving body to superimpose the video on an actual outside scene (340). The image data includes a first display object (185) and a second display object (186). The first display object (185) includes a lower part object (185b). The lower part object (185b) has a lower part (185b1), an upper right part (185b2) and an upper left part (185b3). A length of the lower part (185b1) along a normal direction is longer than lengths of the upper right and upper left parts (185b2, 185b2). The second display object (186) is disposed in the image (187) with reference to a display position of the first display object (185). The second display object (186) includes information on the moving body.