16. The method as claimed in claim 10 , wherein the updating comprises deleting a pronunciation string that a user does not use for more than a predetermined number of time among the pronunciation strings stored in the user pronunciation lexicon and adding a pronunciation string that is not stored in the user pronunciation lexicon among the pronunciation strings generated based on the pronunciation pattern rule.
10. A voice recognition method of an electronic device comprising: receiving a user voice; obtaining a word corresponding to the user voice using a user pronunciation lexicon, obtaining a first pronunciation for a phoneme included in the user voice, comparing the first pronunciation and a second pronunciation pre stored for the word, identifying a pronunciation pattern by using a result of the comparing, updating a user pronunciation lexicon according to a pronunciation pattern rule obtained based on the pronunciation pattern, wherein the pronunciation pattern rule is a rule that a user repeats according to at least one of a pronunciation habit of the user and a pronunciation characteristic of the user.