9. The system as recited in claim 1 , wherein when a query is related to a set function, the result organizing means applies the set function to the merged query condition evaluation result, acquires a final result, outputs the final result with the merged query condition evaluation result.
9. The system as recited in claim 1 , wherein when a query is related to a set function, the result organizing means applies the set function to the merged query condition evaluation result, acquires a final result, outputs the final result with the merged query condition evaluation result. 10. The system as recited in claim 9 , wherein the query condition evaluating means performs query condition evaluation on the new data, separates the query evaluation result based on window, document and node levels and hierarchically stores the query evaluation result.