In controlling a network printer, a driver program of the printer connected through the network is installed. A first network group identifier step acquires a group identifier of the network according to the installation or a network group identifier based on the group identifier. An identifier of the printer and the network group identifier are stored in association with each other. A printing request is performed for requesting a printer connected through the network, which is the same as or different from the printer of which the driver program is installed, to perform a printing process. A second network group identifier step acquires, in accordance with the printing request, a group identifier of the network to which the user is connected or a network group identifier.