Fuente: Wipo "IOT" The present invention relates to an operating method of an IoT server for an IoT linkage service to provide the linkage service which controls a state change of other IoT devices in response to an occurrence event of the IoT device. According to an embodiment of the present invention, the operating method of an IoT server for an IoT linkage service comprises the steps of: receiving content playing state information from at least one of a set-top box and a content server in an environment in which the set-top box and an IoT device are linked through an IoT server; determining whether a state change of the IoT device is necessary based on the playing state information; and transmitting control information for changing a state of the IoT device to the IoT device in accordance with the determination. COPYRIGHT KIPO 2022