1. A method of analyzing an echo image containing a contour of an organ with reduced manual operation, the method including the steps of: obtaining said echo image; (1) setting a search region including a connecting line segment connecting each pair of adjacent ones of known points on said contour; (2) setting a search line segment that originates from a point bisecting said connecting line segment of said search region and reaches an end of said search region; (3) searching each search line segment for a contour point constituting said contour; and forming said contour by connecting said contour points on said search line segments.