Question-answer service system and method based on rdf search

A question-answer service system based on RDF search, comprising:

• an element extracting unit that extracts elements, which are a subject, a predicate, and an object, from a text document composed of the unstructured sentences not having the structural format;
• an identifier coder coding the unique identifier to the extracted subject, predicate, object;
• an RDF constructing unit that Creates one RDF model by using the extracted one subject S, predicate P, and object O, and constructs an RDF network on the basis of the created RDF model;
• a question-answer service unit that searches and provides a subject S, a predicate P. or an object which corresponds to an answer for a question inputted from a user, on the basis of the RDF network;
• and
• a controller that separates the created RDF models when there is semantic collision and integrates the RDF models when there is not semantic collision by determining whether there is semantic collision among the RDF models such that the RDF network is constructed, creates a question for search by interpreting the input question, and provides an object O, a predicate P, or a subject S which corresponds to an answer for the question from the RDF model searched through the RDF network.