A modular-type home gateway system that includes a HomePNA controller connectable to an existing home telephone line, for providing a home network interface; an ADSL controller connected to a prior outdoor telephone line for providing an access network interface; and a system controller for controlling the HomePNA controller and the ADSL controller, the HomePNA controller and the ADSL controller formed as a modular type that are detachably connected to the system controller through a predetermined interface, and that provides a bridge function between a home network and an access network. The modular-type home gateway system provides a plurality of informational terminals connected to the home network with various data sharing functions (e.g., Internet service sharing function, a peripheral device sharing function, file/and application program sharing function, and an entertainment service sharing function like a network game) for not only narrow-band service data but also wide-band service data.