To surely adjust coordinates of a trace pointer to a scale value.

A scientific calculator 1 comprises: a display part 15 performing display with multiple dots; and a CPU 11 making the display part 15 display an XY axis and displaying scales with a prescribed scale interval on the X axis. The CPU 11 displays a graph in a coordinate system set by the XY axis and a trace pointer T on the graph, moves the trace pointer T on the graph by each dot on the X axis direction according to a user operation, and displays a coordinate value of the trace pointer T on the display part 15. The CPU 11 sets a numerical value width of the X axis so that a value which is a divided value of the numerical value width of the X axis by the scale interval equals one integer-th of the number of dots in the X axis direction, and displays the X axis.