A print control method in a network environment is provided in which a computer of a LAN transmits print data to a printer of another LAN via the Internet. On the Internet, a terminal device transmits print data to a print server managing a printer so as to use the printer for printing. As a communication protocol between the terminal device and the print server, HTTP is used. In the terminal device, a header including information about the printer to be used is added to the print data, which are transmitted. In the print server, the print data are received, and the print data are transmitted to the printer in accordance with the header of the print data. In the printer, the print data are printed.