An oven comprising: a case; a cooking compartment provided in the case; a door provided to open and close an opening at a front of the cooking compartment; a monitoring unit disposed outside of the cooking compartment to take an image of an inside of the cooking compartment and comprising a camera module configured to take the image of the inside of the cooking compartment in a direction from the front of the cooking compartment toward a rear of the cooking compartment, and disposed to be inclined with respect to an inner surface of the door in the direction from the front of the cooking compartment toward the rear of the cooking compartment; a lighting unit disposed in the cooking compartment; a display module (60, 60a) configured to receive an input from a user and comprising a display portion to display a state of the input from the user; a communication board configured to communicate with an external device that is external to the oven; and a controller configured to: receive information from the external device through the communication board and receive information from the user through the display module (60, 60a), control the camera module to take an image of the inside of the cooking compartment, based on information received from the external device and information received through the display module (60, 60a), when the information is received from the external device, control the communication board to transmit information obtained by the camera module to the external device, and when the information is received through the display module (60, 60a), control the display portion to display the information obtained by the camera module, wherein the lighting unit is turned on before the camera module images the inside of the cooking compartment. a case; a cooking compartment provided in the case; a door provided to open and close an opening at a front of the cooking compartment; a monitoring unit disposed outside of the cooking compartment to take an image of an inside of the cooking compartment and comprising a camera module configured to take the image of the inside of the cooking compartment in a direction from the front of the cooking compartment toward a rear of the cooking compartment, and disposed to be inclined with respect to an inner surface of the door in the direction from the front of the cooking compartment toward the rear of the cooking compartment; a lighting unit disposed in the cooking compartment; a display module (60, 60a) configured to receive an input from a user and comprising a display portion to display a state of the input from the user; a communication board configured to communicate with an external device that is external to the oven; and a controller configured to: receive information from the external device through the communication board and receive information from the user through the display module (60, 60a), control the camera module to take an image of the inside of the cooking compartment, based on information received from the external device and information received through the display module (60, 60a), when the information is received from the external device, control the communication board to transmit information obtained by the camera module to the external device, and when the information is received through the display module (60, 60a), control the display portion to display the information obtained by the camera module, receive information from the external device through the communication board and receive information from the user through the display module (60, 60a), control the camera module to take an image of the inside of the cooking compartment, based on information received from the external device and information received through the display module (60, 60a), when the information is received from the external device, control the communication board to transmit information obtained by the camera module to the external device, and when the information is received through the display module (60, 60a), control the display portion to display the information obtained by the camera module, wherein the lighting unit is turned on before the camera module images the inside of the cooking compartment.