13. The method of claim 11 , wherein the displaying the plurality of domains on the screen includes displaying a domain classified into a layer according to a speech recognition level.
13. The method of claim 11 , wherein the displaying the plurality of domains on the screen includes displaying a domain classified into a layer according to a speech recognition level. 16. The method of claim 13 , wherein the displaying the plurality of domains on the screen includes displaying a domain corresponding to a lower layer of the at least one domain according to the selection of the user.