A display apparatus configured to project 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 on which visible light is reflected and a second region through which visible light is transmitted and by which visible light is emitted when receiving ultraviolet light that has a predetermined wavelength, the display apparatus comprising: an image data acquisition unit configured to acquire image data which is data of the image, the display apparatus being characterized by: an image processing unit configured to, based on region distribution information which is information about a distribution of the first and the second regions on the target projection surface, generate projection image data by performing, on the acquired image data, image conversion processing including color conversion in which a first wavelength corresponding to visible light is selected for pixels corresponding to the first region and a second wavelength corresponding to the predetermined wavelength of ultraviolet light is selected for pixels corresponding to the second region; a laser light source unit comprising a first diode and a second diode, the first diode being configured to emit light having the first wavelength and the second diode being configured to emit light having the second wavelength; a laser light source control unit configured to output a laser drive signal based on the projection image data to control the output of light from the laser light source unit; and a scanner unit configured to project the image formed by the emitted light onto the target projection surface. an image data acquisition unit configured to acquire image data which is data of the image, the display apparatus being characterized by: an image processing unit configured to, based on region distribution information which is information about a distribution of the first and the second regions on the target projection surface, generate projection image data by performing, on the acquired image data, image conversion processing including color conversion in which a first wavelength corresponding to visible light is selected for pixels corresponding to the first region and a second wavelength corresponding to the predetermined wavelength of ultraviolet light is selected for pixels corresponding to the second region; a laser light source unit comprising a first diode and a second diode, the first diode being configured to emit light having the first wavelength and the second diode being configured to emit light having the second wavelength; a laser light source control unit configured to output a laser drive signal based on the projection image data to control the output of light from the laser light source unit; and a scanner unit configured to project the image formed by the emitted light onto the target projection surface. an image processing unit configured to, based on region distribution information which is information about a distribution of the first and the second regions on the target projection surface, generate projection image data by performing, on the acquired image data, image conversion processing including color conversion in which a first wavelength corresponding to visible light is selected for pixels corresponding to the first region and a second wavelength corresponding to the predetermined wavelength of ultraviolet light is selected for pixels corresponding to the second region; a laser light source unit comprising a first diode and a second diode, the first diode being configured to emit light having the first wavelength and the second diode being configured to emit light having the second wavelength; a laser light source control unit configured to output a laser drive signal based on the projection image data to control the output of light from the laser light source unit; and a scanner unit configured to project the image formed by the emitted light onto the target projection surface.