Abstract: A domain covering a drawing data subjected to information processing is determined and equally divided into meshes of predetermined smallest size. For each of vectors constituting a drawing data subjected to the processing, the number of the meshes traversed by the vector is counted. When the number of the meshes traversed by a given one of the vectors exceeds a predetermined value, the domain is equally divided into meshes of a larger mesh size and the number of the updated meshes traversed by the given one vector is counted. By repeating this operation, all the vectors are stored in a memory as the drawing information in terms of the mesh size and the coordinates of the meshes traversed by vector. Since the number of the meshes traversed by the vector thus can not exceed the predetermined value, the speeding-up of the drawing information processing can be accomplished. A predetermined value may be provided for the mesh size, if desired.