1. A method for rendering outlines of characters of multimedia contents by a controller included in a computer comprising: (a) detecting parameter values for deriving the outlines of the characters that include a screen width (SW), a two-dimensional screen point (SP), a three-dimensional view point (VP), and a field of view (fov) on both ends of the screen width (SW) from a position of a user, which are associated with the characters to be displayed on the screen from the multimedia contents; (b) when an outline thickness information (TH) on established two-dimensional outlines is input to the characters, calculating positional information (SPx) on an x-axis direction of the characters for a two-dimensional screen, on which the characters are displayed, based on the parameter values; (c) calculating an outline thickness factor (SF) of the characters in three dimensions, based on the positional information (SPx) of the x-axis direction of the characters on the two-dimensional screen, positional information (VPx) in an x-axis direction of the characters for a three-dimensional spatial coordinate, and the outline thickness information (TH) of the character in two dimensions; and (d) performing and processing an outline rendering on the characters based on a calculated outline thickness factor (SF) and outputting it on the screen.