Information processing method and device

Efficient processing of image data and a high processing speed can be readily achieved at lower cost. A main CPU (44) converts coordinates of a polygon in response to a manual operation of an operation unit by a user and transmits data of the polygon to a programmable packet engine (48) via a main bus (41). The packet engine (48) calculates a Z value representative of the position of the polygon in the depthwise direction from coordinate values of the apexes of the polygon supplied from the main CPU (44), divides the polygon into a number of sub-polygons corresponding to the Z value, converts coordinate values of the apexes of the sub-polygons in accordance with a normal vector and curved surface parameters and produces a curved surface composed of the sub-polygons. A graphical processing unit (49) writes pixel data of the sub-polygons produced by the programmable packet engine (48) into a frame buffer (58) and performs rendering processing.