18. The method for bi-directional sign language/speech translation in real time of claim 14 , wherein the outputting the second sign or the second speech comprises: recognizing the first sign externally made by the user; generating a sign index to translate into the second speech corresponding to the recognized first sign; and outputting the second speech corresponding to the recognized first sign based on the generated sign index.
18. The method for bi-directional sign language/speech translation in real time of claim 14 , wherein the outputting the second sign or the second speech comprises: recognizing the first sign externally made by the user; generating a sign index to translate into the second speech corresponding to the recognized first sign; and outputting the second speech corresponding to the recognized first sign based on the generated sign index. 20. The method for bi-directional sign language/speech translation in real time of claim 18 , wherein the generating comprises: determining the sign index with respect to the recognized first sign using a predefined sign language dictionary; converting the recognized first sign to a text based on the determined sign index; and generating a sentence associated with the first sign with respect to the text through a keyword combination corresponding to the text and the used pattern of sign language by the user.