A display apparatus controlled based on a user's uttered voice and a method of controlling a display apparatus based on a user's uttered voice are provided. A display apparatus includes a processor, a memory, and a display. The processor is configured to receive an uttered voice of a user, determine text corresponding to the uttered voice of the user as an intermediate recognition result, determine a command based on a result obtained by comparing the intermediate recognition result with a previous intermediate recognition result that is stored in the memory, and perform an operation according to the command.