System and method of operating the system with a certificate management function of the sensor node and the Subscription

The invention enables the system with the authentication management and Subscription function of the sensor node, relates to a operating method of the system, only the user terminal receives the IP is applied allowed during communication of the sensor nodes can have access to the sensor nodes that is, it not allowed to block the direct access to the sensor nodes of the user terminal to be used to enhance the security of the sensor node. According to the invention, the relay server receives the Subscription message from the user terminal. The relay server checks the validity of the authorization, the user terminal. If the user terminal the terminal has a valid authority, the relay server transmits a Subscription message to the sensor node, and transmitting a Subscription accept message to the user terminal. And the sensor node transmits the collected information is stored in the user terminal has a valid authority.