Disclosed are an electronic apparatus, a display apparatus and a method of controlling the same. The electronic apparatus includes a speaker configured to output a sound; a microphone configured to receive a user voice; a communicator configured to perform communication; and a processor. The processor is configured to: identify a state of an external apparatus through the communicator based on reception of the user voice, process the received user voice and output a sound corresponding to a process result through the speaker based on identification that the external apparatus is in a turned-off state, and control the communicator to transmit information about the received user voice to the external apparatus and request the external apparatus to process the voice based on identification that the external apparatus is in a turned-on state.