An interactive system, a display apparatus, and a controlling method are provided. The display apparatus includes an input which receives an uttered voice of a user; a communicator which transmits a voice signal of the uttered voice to a voice recognition apparatus; a voice recognizer which performs a voice recognition process with the uttered voice; and a controller which determines first or second voice information which has a reliability value greater than or equal to a preset threshold value among a reliability value of the first voice information, and a reliability value of the second voice information to be an execution command of the uttered voice. Therefore, if the display apparatus and an external apparatus simultaneously recognize the uttered voice of the user, the display apparatus selects a voice recognition result proximate to an intent of the user from two voice recognition results.