An onboard display control apparatus mounted on a vehicle and controlling a head-up display displaying information is provided. The onboard display apparatus includes: a space information acquisition section that acquires information representing a position of an object in front of the vehicle; an eye point information acquisition section that acquires information representing a position of an eye; a display controller that determines a display mode of a display image, causing the display image to be displayed and overlapped with a specific target in a visual field of a driver; an output section that provides the display image in accordance with the display mode. The display controller adjusts the display mode of the display image based on information representing behavior of the vehicle, information representing a property of an external environment, or information representing physical ability of the driver.