An electronic apparatus, a method, and computer-readable medium are disclosed. The electronic apparatus includes a communicator, a display, and a processor. The communicator is configured to obtain a brainwave signal. The processor is configured to display on the display a character input window and a keyboard UI including a plurality of character keys. The processor is also configured to identify a character key to input to the character input window from the plurality of character keys based on at least one channel signal from the obtained brain wave signal. The channel signal includes a F7 channel, a F8 channel, and an AF3 channel. The processor is also configured to display a character corresponding to the identified character key to the character input window.