An object of the present invention is to provide a map display device and a map display method that facilitate comprehension of relevance between drawing objects in a plurality of map drawing pictures and improve user operability. The map display device according to the present invention includes: a controller that controls an overlapping state between the first and second drawing pictures in accordance with the input of user operation and outputting, to a display unit, a picture in which one of the first and second drawing objects masks the other in a portion in which the first and second drawing pictures overlap each other. The controller controls the overlapping state to prevent the priority drawing object in the first drawing picture from becoming invisible in the drawing picture display.