An artificial intelligence (AI) system which utilizes machine learning algorithm such as deep learning and application is provided. The artificial intelligence (AI) system includes a controlling method of an electronic device for determining a chatbot using an artificial intelligence learning model includes receiving a voice uttered by a user, processing the voice and acquiring text information corresponding to the voice, and displaying the text information on a chat screen, determining a chatbot for providing a response message regarding the voice by inputting the acquired text information and chat history information regarding the chat screen to a model which is trained to determine the chatbot by inputting text information and chat history information, transmitting the acquired text information and the chat history information regarding the chat screen to a server for providing the determined chatbot, and receiving a response message from the server and displaying the response message on the chat screen.