A print output control apparatus, a print output control method, and a computer-readable recording medium storing a computer program having print output control capabilities. Print preview is displayed by use of print data to enhance user interface. A print output control apparatus comprises: a printer driver for converting data in the file into print data recognizable by the printer; a print data storage unit for storing the print, data supplied from the printer driver; a window display unit, executed by the printer driver, for acquiring the print data from the print data storage unit and displaying, onto a display device coupled to the computer, a preview window having a preview box for displaying the print data and a print data processing box operable by a user for changing the print data; and a print data processing unit, executed by the window display unit, for changing the print data when the user operates the print data processing box.