An operating method of a mobile terminal comprising: receiving state information of a refrigerator from the refrigerator; and displaying the state information of the refrigerator on a screen; transmitting a control signal based on a control operation to the refrigerator; wherein the method further comprises: displaying a menu picture comprising a refrigerator management menu including a monitoring item, a food management item, a software upgrade item; when the food management item is selected, displaying images of foods stored in the refrigerator on the screen; when a food image of the food images in the screen is selected, displaying a food image area including the selected food image, a stored food information display area for displaying food information associated with the selected food image, a barcode recognition area, and a delete button, when the delete button is selected, deleting the food information associated with the selected food image, and wherein the method further comprises: when the monitoring item is selected, displaying a monitoring picture including freezing chamber temperature information, refrigerating chamber temperature information, operation diagnosis information, and a service call item, when the service call item is selected, making a connection to a service center server to transmit refrigerator diagnosis data to the service center server and displaying a service center connection state picture, and if refrigerator diagnosis data transmission is completed, displaying a diagnosis information transmission completion picture. receiving state information of a refrigerator from the refrigerator; and displaying the state information of the refrigerator on a screen; transmitting a control signal based on a control operation to the refrigerator; wherein the method further comprises: displaying a menu picture comprising a refrigerator management menu including a monitoring item, a food management item, a software upgrade item; when the food management item is selected, displaying images of foods stored in the refrigerator on the screen; when a food image of the food images in the screen is selected, displaying a food image area including the selected food image, a stored food information display area for displaying food information associated with the selected food image, a barcode recognition area, and a delete button, when the delete button is selected, deleting the food information associated with the selected food image, and displaying a menu picture comprising a refrigerator management menu including a monitoring item, a food management item, a software upgrade item; when the food management item is selected, displaying images of foods stored in the refrigerator on the screen; when a food image of the food images in the screen is selected, displaying a food image area including the selected food image, a stored food information display area for displaying food information associated with the selected food image, a barcode recognition area, and a delete button, when the delete button is selected, deleting the food information associated with the selected food image, and wherein the method further comprises: when the monitoring item is selected, displaying a monitoring picture including freezing chamber temperature information, refrigerating chamber temperature information, operation diagnosis information, and a service call item, when the service call item is selected, making a connection to a service center server to transmit refrigerator diagnosis data to the service center server and displaying a service center connection state picture, and if refrigerator diagnosis data transmission is completed, displaying a diagnosis information transmission completion picture. when the monitoring item is selected, displaying a monitoring picture including freezing chamber temperature information, refrigerating chamber temperature information, operation diagnosis information, and a service call item, when the service call item is selected, making a connection to a service center server to transmit refrigerator diagnosis data to the service center server and displaying a service center connection state picture, and if refrigerator diagnosis data transmission is completed, displaying a diagnosis information transmission completion picture.