1. A display control device in a display system including a detection device that detects a predetermined object that exists in surroundings of a movable body, a calculator that calculates a detection accuracy of the detection device, an image generator that generates a predetermined image, and a displayer that outputs the predetermined image on a display medium to display a graphic having a predetermined shape on the display medium, the display control device comprising: an obtainer that obtains the detection accuracy; and a controller that controls, based on the detection accuracy, the image generator so as to generate the predetermined image that shows the graphic having a predetermined shape when displayed on the display medium, wherein the controller controls the image generator so as to generate a first predetermined image as the predetermined image, when the obtainer obtains a first detection accuracy, and controls the image generator so as to generate a second predetermined image as the predetermined image, when the obtainer obtains a second detection accuracy lower than the first detection accuracy, wherein the first predetermined image shows, as the graphic having a predetermined shape, a first graphic divided into n regions when displayed on the display medium, and the second predetermined image shows, as the graphic having a predetermined shape, a second graphic divided into m regions or undivided when displayed on the display medium, and n is an integer greater than or equal to 2, and m is an integer that is greater than or equal to 2 and that is smaller than n.