A processing method of data transmitted from sensor nodes, including: providing a model list that stores preset model names; providing a semantic interpretation list that stores semantic information corresponding to a value of the data; providing an event table that stores monitoring conditions of values of data corresponding to the model names; receiving data corresponding to the model names from the sensor nodes; notifying an occurrence of an event when receiving data satisfying the monitoring conditions from the sensor nodes; and executing processing previously specified when an occurrence of an event is notified.