Where each of m and n are any natural number: a drawing region subdivider 5 for subdividing a drawing region into an m×n matrix of drawing subregions having m rows and n columns,; a target vector data selector 6 for discriminating, for each of the drawing subregions, vector data necessary for drawing the drawing subregion from vector data of an image; and a subdivisional drawer 7 for drawing, for each of the drawing subregions after the subdivision by the drawing region subdivider 5, an image based on a drawing subregion target vector data 23 discriminated by the target vector data selector 6 are provided as necessary for drawing the drawing subregion. Preferably, a curve vector data replacer 71 of the subdivisional drawer 7, for each of the drawing subregions, replaces curve vector data outside of the drawing subregion from vector data configuring a figure to be subdivisionally drawn with straight-line vector data and performs a fill processing.