A gateway in a remote access system that includes: the gateway that connects a public network and a home network; and a management center that controls, via the public network, an appliance connected to the home network, the gateway comprising: a sensor information collection unit that collects state information of a sensor (3,4) connected to the home network; characterized by a management center coordination unit that: transfers the state information to the management center; and obtains simplified rule information from the management center, the simplified rule information being a part of a control rule that is defined in the management center and includes a plurality of conditions to control the appliance; a simplified rule database that manages the simplified rule information; and an appliance control unit that controls the appliance on a basis of the simplified rule information and the state information, wherein the gateway receives authority to control the appliance by obtaining the simplified rule information from the management center, wherein a simplified rule is a part of the control rule where at least one of the plurality of conditions of the control rule is determined to match data in a sensor state database of the management center. the gateway that connects a public network and a home network; and a management center that controls, via the public network, an appliance connected to the home network, the gateway comprising: a sensor information collection unit that collects state information of a sensor (3,4) connected to the home network; characterized by a management center coordination unit that: transfers the state information to the management center; and obtains simplified rule information from the management center, the simplified rule information being a part of a control rule that is defined in the management center and includes a plurality of conditions to control the appliance; a simplified rule database that manages the simplified rule information; and an appliance control unit that controls the appliance on a basis of the simplified rule information and the state information, wherein a sensor information collection unit that collects state information of a sensor (3,4) connected to the home network; characterized by a management center coordination unit that: transfers the state information to the management center; and obtains simplified rule information from the management center, the simplified rule information being a part of a control rule that is defined in the management center and includes a plurality of conditions to control the appliance; transfers the state information to the management center; and obtains simplified rule information from the management center, the simplified rule information being a part of a control rule that is defined in the management center and includes a plurality of conditions to control the appliance; a simplified rule database that manages the simplified rule information; and an appliance control unit that controls the appliance on a basis of the simplified rule information and the state information, wherein the gateway receives authority to control the appliance by obtaining the simplified rule information from the management center, wherein a simplified rule is a part of the control rule where at least one of the plurality of conditions of the control rule is determined to match data in a sensor state database of the management center.