In an image forming apparatus enabling communication through a network and having a monochrome-printing mode and a color-printing mode, by, in a case where printing of a Web page downloaded through the network is instructed, determining whether or not there is any color image in the Web page, and by, if there is any color image, setting a printing mode for the Web page in accordance with information on the size of the image, whether color printing is printed or monochrome printing is implemented can be automatically determined in consideration of users' convenience.