Display device, display method, and storage medium

A display device comprising:

• a controller that determines a form in which to display a display object indicating a guide image that is based on a route a vehicle is scheduled to drive on;
• and
• a display that projects light that forms the display object in the form determined by the controller onto a light-transmissive display medium in the vehicle that reflects the light toward a user in the vehicle, making the display object that is displayed beyond the display medium visible to the user as a virtual image, wherein
• when a condition related to driving of the vehicle is satisfied, the controller determines the form in which to display the display object so as to give the display object a shape based on a firt view of the virtual image from a first angle of depression is greater than a second angle of depression based on a second view of the virtual image from a viewpoint of the user through the display medium.