A display apparatus comprising: a communicator configured to communicate with a voice recognition apparatus; an input unit configured to receive an uttered voice of a user; a display; and a processor configured to, based on the display apparatus being turned on, control the communicator to transmit connection request information to the voice recognition apparatus for connecting with the voice recognition apparatus which is configured to perform a voice recognition of the uttered voice of the user, based on a predetermined event occurring within a first threshold time while a connection with the voice recognition apparatus is maintained, activate a voice recognition mode for recognizing the uttered voice of the user, based on the predetermined event not occurring within the first threshold time while the connection with the voice recognition apparatus is maintained, control the communicator to transmit a dummy data to the voice recognition apparatus for maintaining the connection with the voice recognition apparatus, based on the uttered voice being inputted through the input unit within a second threshold time while the voice recognition mode is activated, control the communicator to transmit voice information regarding the uttered voice to the voice recognition apparatus, based on the uttered voice of the user not being inputted within the second threshold time while the voice recognition mode is activated, control the communicator to transmit a dummy data to the voice recognition apparatus for maintaining the connection , and based on voice recognition result information about the uttered voice of the user being received from the voice recognition apparatus, control the display to display a result screen corresponding to the voice recognition result information. a communicator configured to communicate with a voice recognition apparatus; an input unit configured to receive an uttered voice of a user; a display; and a processor configured to, based on the display apparatus being turned on, control the communicator to transmit connection request information to the voice recognition apparatus for connecting with the voice recognition apparatus which is configured to perform a voice recognition of the uttered voice of the user, based on a predetermined event occurring within a first threshold time while a connection with the voice recognition apparatus is maintained, activate a voice recognition mode for recognizing the uttered voice of the user, based on the predetermined event not occurring within the first threshold time while the connection with the voice recognition apparatus is maintained, control the communicator to transmit a dummy data to the voice recognition apparatus for maintaining the connection with the voice recognition apparatus, based on the uttered voice being inputted through the input unit within a second threshold time while the voice recognition mode is activated, control the communicator to transmit voice information regarding the uttered voice to the voice recognition apparatus, based on the uttered voice of the user not being inputted within the second threshold time while the voice recognition mode is activated, control the communicator to transmit a dummy data to the voice recognition apparatus for maintaining the connection , and based on voice recognition result information about the uttered voice of the user being received from the voice recognition apparatus, control the display to display a result screen corresponding to the voice recognition result information. <EOS>