VEHICLE DISPLAY DEVICE, VEHICLE DISPLAY SYSTEM, VEHICLE DISPLAY METHOD, AND NON-TRANSITORY STORAGE MEDIUM STORED WITH PROGRAM

A vehicle display device includes: an obstacle information acquisition section configured to acquire information relating to a plurality of obstacles in surroundings of a vehicle; and a mark display section configured to display a predetermined individual mark prompting caution toward an individual obstacle among the plurality of obstacles by superimposed display in a display region inside a vehicle cabin, and to display a predetermined cluster mark prompting caution toward a plurality of the obstacles by superimposed display in the display region in a case in which a predetermined condition has been satisfied.