Disclosed are a refrigerator and a method for displaying a user interface on the refrigerator, a user terminal, and a method for performing a function in the user terminal. The refrigerator according to the present disclosure may include: a storage chamber storing food therein; a temperature detection unit configured to detect the internal temperature of the storage chamber; a cooling unit configured to supply cold air to the storage chamber; a camera configured to photograph food in the storage chamber; a communication unit configured to communicate with a user terminal; a display; at least one processor electrically connected to the temperature detection unit, the camera, the cooling unit, and the communication unit; and a memory electrically connected to the at least one processor.