Fuente: Wipo "IOT" The present invention provides a method of controlling an IOT device, a cloud server and system for controlling an IOT device, the method comprising the steps of: receiving a device identifier extracted from an image code recognized by a portable terminal; determining an IoT device corresponding to the received device identifier among a plurality of IoT devices which can be connected to a broadband network; recognizing one or more control items and one or more state items corresponding to the determined IoT device; and transmitting control state information including one or more control itemsrepresenting a current control state capable of controlling the determined IoT device and the state information including the one or more state items of the determined IoT device to the portable terminal.