1. A control method of an electro-optical device including a display unit having a plurality of pixels, which are provided corresponding to intersections of a plurality of scanning lines and a plurality of data lines crossing each other and each of which has an electro-optical material interposed between a pixel electrode and a counter electrode facing each other, and a driving unit that performs electric potential supply, which is for supplying a data potential according to image data to the pixel electrode of each of the plurality of pixels in a predetermined frame period, multiple times in order to display an image corresponding to the image data on the display unit, the control method comprising: performing a first supply process for supplying an electric potential corresponding to a changed gray level to the pixel electrode of a first pixel whose gray level to be displayed changes at the time of image rewriting in which an image displayed on the display unit is rewritten; performing a second supply process for supplying the same electric potential as an electric potential of the counter electrode to the pixel electrode of a second pixel whose gray level to be displayed does not change at the time of the image rewriting; extracting a contour image from a difference between an image before the image rewriting and an image after the image rewriting; determining whether or not the first supply process is being performed, in units of a pixel, for contour display pixels that display the contour image; and performing a contour elimination process for supplying an electric potential for eliminating the contour image to the pixel electrode of a pixel, for which it is determined that the first supply process is not being performed, among the contour display pixels.