3. The method of claim 2 , wherein the performing the syntax analysis comprises: outputting a syntax expression obtained by analyzing whether the separated keywords have any grammar relationship and semantic relations within a sentence as the result of the syntax analysis.
3. The method of claim 2 , wherein the performing the syntax analysis comprises: outputting a syntax expression obtained by analyzing whether the separated keywords have any grammar relationship and semantic relations within a sentence as the result of the syntax analysis. 4. The method of claim 3 , wherein the syntax expression is at least one of logical expressions, modification-modified expressions and syntax list expressions.