1. Method of inputting digitalized, two value graphic pattern data of a character or a symbol into a memory device, characterized by that: the contour line of the graphic pattern is traced from a start point selected from a plurality of sampling points arranged on the contour line, and the positional data of the sampling points detected in the course of the tracing of the contour line is analyzed, each sampling point is compared to see if it satisfies the requirement that l.multidot..theta.&gt;.kappa., wherein l is the length of a line segment connecting the sampling point with a following sampling point, .theta. is the angle defined by this line segment and a preceding line segment and .kappa. is a predetermined constant, and the sampling point is sequentially stored in the memory device as a graphic pattern data if it satisfies the equation.