In a host computer, a print processor generates, in a drawing region of a memory device context, additional raster data for drawing an additional drawing in addition to drawing information regarding a logical page included in an Enhanced Metafile Format (EMF) spool file, and a graphics driver (GD) module of a printer driver combines document raster data generated in a drawing region of a printer device context with the additional raster data, and generates print data based on post-combination raster data.