A display device which displays a plurality of objects on a screen has a group configuration storage section for storing association information indicating the association between each of the plurality of objects and one of a plurality of groups, a group priority level storage section for storing group display priority levels which are priority levels for displaying each of the objects associated with one of the groups at the front of the objects associated with the other groups, an object priority level storage section for storing object display priority levels which are priority levels for displaying one of the objects associated with one of the groups at the front of the others, an object priority level changing section for changing the object display priority level while the association information is maintained, and a display section for displaying the plurality of objects according to the group display priority levels and the object display priority levels.