A home appliance comprising: a door; a door sensor configured to sense whether the door is opened or closed; a display which is an internal display provided inside the home appliance; a main processor; a sub-processor configured to control a display operation of the display; and a power controller configured to switch a supply of electrical power to the sub-processor between an on state and an off state to thereby switch the display operation of the display between an on state and an off state, wherein the main processor is configured to: receive a signal from the door sensor indicating whether the door is opened or closed, generate a control signal for the power controller to switch the supply of electrical power to the sub-processor based on the signal received from the door sensor, and control the power controller to switch the supply of electrical power to the sub-processor according to the control signal, wherein in the generating of the control signal, generate a first control signal for turning on the electrical power of the sub-processor based on a door opening operation sensed by the door sensor, and generate a second control signal for turning off the electrical power of the sub-processor at a predetermined time after the door is closed based on a door closing operation sensed by the door sensor. a door; a door sensor configured to sense whether the door is opened or closed; a display which is an internal display provided inside the home appliance; a main processor; a sub-processor configured to control a display operation of the display; and a power controller configured to switch a supply of electrical power to the sub-processor between an on state and an off state to thereby switch the display operation of the display between an on state and an off state, wherein the main processor is configured to: receive a signal from the door sensor indicating whether the door is opened or closed, generate a control signal for the power controller to switch the supply of electrical power to the sub-processor based on the signal received from the door sensor, and control the power controller to switch the supply of electrical power to the sub-processor according to the control signal, wherein in the generating of the control signal, generate a first control signal for turning on the electrical power of the sub-processor based on a door opening operation sensed by the door sensor, and generate a second control signal for turning off the electrical power of the sub-processor at a predetermined time after the door is closed based on a door closing operation sensed by the door sensor. receive a signal from the door sensor indicating whether the door is opened or closed, generate a control signal for the power controller to switch the supply of electrical power to the sub-processor based on the signal received from the door sensor, and control the power controller to switch the supply of electrical power to the sub-processor according to the control signal, wherein in the generating of the control signal, generate a first control signal for turning on the electrical power of the sub-processor based on a door opening operation sensed by the door sensor, and generate a second control signal for turning off the electrical power of the sub-processor at a predetermined time after the door is closed based on a door closing operation sensed by the door sensor.