An information processing apparatus for forming print data to be print-processed by a printer is constructed by: designation receiving means for receiving designation of a duplex printing, discriminating means for discriminating the number of pages in the case where data to be printed has been arranged on a recording paper, and command adding means for receiving the designation of the duplex printing by the designation receiving means and, in the case where it is determined by the discriminating means that the number of pages of the recording paper on which the data to be printed has been arranged is equal to an odd number, adding a command to urge a forced paper ejection in the printer lest a blank page of the last page is logically counted in the printer. A print data forming method and a print control program for realizing such an apparatus and a memory medium which stores such a program are provided. When the last page is printed as a blank page in the printer in a duplex printing mode, the print data is formed lest the last blank page is counted up by a counter.