1. A method of analyzing a shape of a wafer, the method comprising: acquiring a sectional image showing a wafer to be analyzed by using an electron microscope; finding a series of coordinates of a surface contour of the wafer in the sectional image; and obtaining shape analysis data including information on a shape of the wafer using the series of coordinates, wherein the finding of the series of coordinates of the surface contour includes: obtaining a luminance of each pixel in the sectional image, obtaining luminance differences between adjacent pixels, determining temporary contour pixels using the luminance differences, re-determining the temporary contour pixels when modification of a temporary surface contour formed by the temporary contour pixels is required, and determining an array of the temporary contour pixels as the series of coordinates of the surface contour when the modification of the temporary surface contour is not required.