To provide a display device for representing positioning such as respective orders and priorities of a plurality of graphs in the graphs themselves to display, for example, in an electronic calculating device having a graph display function.

A plurality of function expressions Y1, Y2,... are sequentially designated, graphed and displayed, it is possible to easily confirm what graphs respective graphs are and to display the graphs in a very clear way even when the plurality of graphs that respectively correspond to the plurality of function expressions are overlapped on the same screen to be displayed because graphs whose drawing orders become old are displayed with their density made light little by little while involved in that fact that a new graph that is designated to be drawn is displayed in maximum density.