A refrigerator which manages an item using artificial intelligence according to an embodiment of the present invention includes a communication unit configured to communicate with another refrigerator; a camera configured to image an inner portion of the refrigerator; and a processor configured to acquire a stock state information of the item from another refrigerator through the communication unit, in a case where the processor detects that the item is taken in or taken out from the refrigerator based on an image photographed by the camera, and to output management guide of the item, based on the acquired stock state information of the item.