Fuente: Wipo "IOT" According to the present invention, a cooperation system for an IoT device based on trust comprises: a first IoT device; a second IoT device to which the first IoT device is connected; a connection system for managing at least one provided to manage the second IoT device; a disclosure information provider providing disclosure information of the connection system for management; a reputation information provider providing reputation information of at least one of the connection system for management and the second IoT device; and a trust information management device calculating a trust index representing degree of trust of the second IoT device. Accordingly, the reliability of each node of a network may be improved. COPYRIGHT KIPO 2021