Provided are an artificial intelligence (AI) system that mimics cognitive functions, such as recognition and determination, of the human brain using a machine learning algorithm such as deep learning and an application thereof. A method of providing feedback information in response to a user input including determining a user's intention, determining a variation in a number of candidates for an operation to be determined to correspond to the intention based on information input by the user, generating feedback information based on the determined variation, and providing the generated feedback information to the user is provided.