Client and server in supervisory control and data acquisition system

Server comprises a communication module for performing communication with at least one of the client and the real-time database in the supervisory control data acquisition system according to one embodiment of the present invention; And if the client is registered, the requirements for the processing of the data the information on the basis of the above requirements is assigned a task for processing of the data, to subscribers to information the client the request corresponding to the client the request for and issued, and then, by the operation processing the data includes a data transmission service module to at least one of subscribing to the information registered the information to said data processing request the client and the request the client.