4. The image display device of claim 1 , wherein the processor is further configured to generate semantic information related to a semantic of the acquired speech query, and wherein the processor is further configured to determine the candidate queries having the same or similar semantic as the acquired speech as those having the same semantic information.
4. The image display device of claim 1 , wherein the processor is further configured to generate semantic information related to a semantic of the acquired speech query, and wherein the processor is further configured to determine the candidate queries having the same or similar semantic as the acquired speech as those having the same semantic information. 5. The image display device of claim 4 , wherein the processor is further configured to: separate the acquired speech query having a form of a sentence into words, tag parts of speech of the separated words, classify the words based on predetermined parts of speech, and generate index information associated with the classified words based on the parts of speech, and wherein the processor is further configured to determine the candidate queries having the same or similar semantic as the acquired speech using the index information including the same semantic information.