The present disclosure relates to a method including: receiving resource requests from clients and converting the resource requests into search requests in sequence; searching a resource list of sensor nodes of cloud according to search conditions of the search request and obtaining a resource ID of the sensor node that meets the search conditions; searching a data list of the sensor node and reading a working frequency of the sensor node in the resource list; comparing the working frequency with a desired frequency in the search conditions to determine if buffered data in the data list can meet requirements; feeding back the buffered data to the clients if the buffered data meets the requirements; and controlling the sensor nodes to collect data according to the search conditions and priorities of the sensor nodes and sending the collected data to the clients if the buffered data cannot meet the requirements.