1. A method for performing voice recognition in a display apparatus, comprising: receiving an uttered voice of a user; extracting voice information from the uttered voice and comparing the voice information to information associated with words in a pronunciation dictionary; based on reliabilities associated with the comparing, determining similar words which are similar to words in the uttered voice; setting, as a target word with respect to the uttered voice, a similar word satisfying a predetermined condition; displaying one or both of the target word and a similar word list including one or more of the similar words other than the target word; setting an execution command; and adjusting a critical value assigned to the similar word set as the execution command from among the plurality of similar words including the target word, wherein, in response to an execution command not being received for a predetermined critical time or in response to a selection command with respect to the target word being received, setting the execution command comprises setting the target word as the execution command.