DISPLAY DEVICE, DISPLAY METHOD, AND PROGRAM

A display apparatus (1) projects an image of an object located in an area outside a mobile body onto a target projection surface, the target projection surface being set in a cabin of the mobile body and having a first region in which a first wavelength light is reflected and a second region in which the first wavelength light is transmitted and in which visible light is emitted by receiving a second wavelength light. The display apparatus (1) includes: an image data acquisition unit that acquires image data; an image processing unit that generates projection image data by performing image conversion processing including color conversion in which the first wavelength light is selected for a pixel corresponding to the first region and the second wavelength light is selected for a pixel corresponding to the second region based on region distribution information; a light source unit that emits light selected from either the first wavelength light or the second wavelength light; and a projection unit that projects the image formed by the emitted light onto the target projection surface.