Abstract: A network system makes it possible to construct a multifunction system using an existing network system currently employed in an office. The network system includes: (a) a printer for carrying out printing; (b) a plurality of clients for outputting various requests including a printing request and facsimile transmission request; (c) a server designed to carry out processing in response to requests sent from the plurality of clients, connected on a facsimile transmission/reception line, and composed of (1) a unit that, when a client outputs a printing request, outputs a printing instruction to the printer, (2) a unit that, when a client outputs a facsimile transmission request, transmits data over the facsimile transmission/reception line, and (3) a unit that, when data is transmitted over the facsimile transmission/reception line, receives the transmitted data.