There is provided a multi-display device capable of displaying the entity of an image even in a case of a large image to be displayed, and capable of changing a horizontally long image screen to a vertically long image screenor vice versa by utilizing no mechanism for rotating, by 90 degrees, a display section and any specific soft therefor. For this purpose, the multi-display device is characterized by arranging a plurality of basic displays each having a function as a display in at least either one of vertical direction and horizontal direction.