1. A data processing method for a clinical decision support system, the method comprising: inferring input data having a natural language format based on an Ontology technique to recognize an input rule coming from the input data; inferring storage data having a natural language format and stored in rule database based on the Ontology technique to recognize a storage rule associated with the input rule from the storage data; comparing the input rule to the storage rule using a Self Evolutionary Rule-base algorithm; and updating the storage data stored in the rule database to the input data according to the result of the comparison, wherein each of the input rule and the storage rule is composed of an item and a detail, and in response to a result of comparing indicating that at least one item included in the input rule is a new item that is not identical to an item included in the storage rule, the updating of the storage data comprises adding the input rule including the new item to the rule database.