11. A method for speech recognition, comprising: determining a situation of a user; displaying a plurality of domains including a general domain and at least one another domain on a screen that are selectable by the user to identify at least one of plurality of domains as a speech recognition region of a predetermined classification for recognition of a speech, and the displaying displays at least one of the plurality of domains with emphasis when information obtained in relation to the determining of the situation of the user indicates relation to the at least one of the plurality of domains to assist the user in a selection of at least one domain from among the plurality of domains; receiving the selection by the user using at least one of a user input device including at least one of a microphone, a touch screen, a keyboard, and a mouse; and transmitting, with an antenna of a communicator, information regarding the selection by the user of the at least one domain among the plurality of domains, wherein the general domain is associated with a database to be referenced to support the recognition of the speech using all subject matter areas and the at least one other domain being associated with a different database than the database of the general domain to be referenced to support the recognition of the speech using a specific subject matter area, and wherein the general domain and the at least one different domain are configured to have a hierarchical structure, and wherein a sentence is constructed using the at least one domain selected by the user in the selection to exemplify a level of recognizability of the speech according to the at least one domain selected by the user.
11. A method for speech recognition, comprising: determining a situation of a user; displaying a plurality of domains including a general domain and at least one another domain on a screen that are selectable by the user to identify at least one of plurality of domains as a speech recognition region of a predetermined classification for recognition of a speech, and the displaying displays at least one of the plurality of domains with emphasis when information obtained in relation to the determining of the situation of the user indicates relation to the at least one of the plurality of domains to assist the user in a selection of at least one domain from among the plurality of domains; receiving the selection by the user using at least one of a user input device including at least one of a microphone, a touch screen, a keyboard, and a mouse; and transmitting, with an antenna of a communicator, information regarding the selection by the user of the at least one domain among the plurality of domains, wherein the general domain is associated with a database to be referenced to support the recognition of the speech using all subject matter areas and the at least one other domain being associated with a different database than the database of the general domain to be referenced to support the recognition of the speech using a specific subject matter area, and wherein the general domain and the at least one different domain are configured to have a hierarchical structure, and wherein a sentence is constructed using the at least one domain selected by the user in the selection to exemplify a level of recognizability of the speech according to the at least one domain selected by the user. 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.