A display control device for controlling a display unit in a vehicle, including a dedicated middleware that executes a dedicated application program on a vehicle side, a general purpose middleware that executes a general purpose application program from an external of the vehicle, and an interface that exchanges necessary information between the dedicate middleware and the general purpose middleware, includes: an activation device that activates the dedicated middleware first, and activates the general purpose middleware after the dedicated middleware; and a dedicated display control device that displays, before an activation of the general-purpose middleware is completed, a dedicated menu screen for activating the dedicated application program on the display unit via the dedicated middleware when the dedicated application program on the dedicated middleware is available.