An information processing apparatus which can obtain a normal print result even for print data of a plurality of color planes. A host computer connected to a printer for outputting color print data, is characterized by a unit adapted to calculate the data sizes of respective color data which form one page of color print data to be output by the printer, a unit adapted to determine a timing, at which a print start instruction is to be issued to the output apparatus, on the basis of the calculated data sizes of respective color data, and a plane transfer size as a data size that can be transferred to the printer during output of one page per color data, and a unit adapted to issue a print start instruction to the printer at the determined timing after the color print data to be output is transferred to the printer.