A method and an apparatus for providing a user interface by using an AI system are provided. The method includes displaying an input window for displaying a text input, on a first region of the screen, and displaying a first user interface on a second region of the screen, the first user interface being provided to select a symbol, receiving a user input for selecting a first symbol through the first user interface, when the user input is determined as a first input event for inputting a text between the first symbol and a second symbol used as a pair with the first symbol based on a user input pattern, displaying the first symbol and the second symbol on the input window, and changing the first user interface displayed on the second region into a second user interface for inputting a text between the first symbol and the second symbol.