A product of printer driver which operates on an operating system making a computer execute a conversion processing to convert data in electronic document format into data in bitmap format, the printer driver flirt her making the computer execute, an accepting process which accepts from the operating system print target data in electronic document format, a first outputting process which generates, based on the print target data in electronic document format, print data in a command language format capable for interpretation by a printer as a control target and outputs the print data thus generated to the printer, and a second outputting process which requests the operating system to convert the print target data in electronic document format into bitmap data, and outputs print data based on the bitmap data thus converted to the printer, and the first outputting process and the second outputting process are selectively performed.