A display device comprising: a first communication unit configured to communicate with a peripheral device 10_1,..., 10_N), which is operable to provide video signals and/or audio signals through a High-Definition Multimedia Interface; a second communication unit configured to communicate with a remote controller; and at least one processor operatively connected to the first and second communication units, wherein the at least one processor is configured to: be initialized in response to a power-on instruction received through the second communication unit from the remote controller, and after being initialized in response to the received power-on instruction, communicate with the peripheral device, through the first communication unit to determine whether or not the peripheral device is powered on within a threshold time, and if it is determined that the peripheral device is not powered on within the threshold time, determine whether the peripheral device supports a High-Definition Multimedia Interface Consumer Electronic Control (HDMI-CEC) function, when it is determined that both (a) the peripheral device is not powered on within the threshold time, and (b) the peripheral device does not support the HDMI-CEC function, transmit, to the remote controller through the second communication unit, a power-on request for allowing the remote controller to power on the peripheral device, and when it is determined that both (a) the peripheral device is not powered on within the threshold time, and (b) the peripheral device does support the HDMI-CEC function, cause the peripheral device to be powered on by the display device through the HDMI-CEC function, wherein the peripheral device is operable to provide video signals and/or audio signals to the display device. a first communication unit configured to communicate with a peripheral device 10_1,..., 10_N), which is operable to provide video signals and/or audio signals through a High-Definition Multimedia Interface; a second communication unit configured to communicate with a remote controller; and at least one processor operatively connected to the first and second communication units, wherein the at least one processor is configured to: be initialized in response to a power-on instruction received through the second communication unit from the remote controller, and after being initialized in response to the received power-on instruction, communicate with the peripheral device, through the first communication unit to determine whether or not the peripheral device is powered on within a threshold time, and if it is determined that the peripheral device is not powered on within the threshold time, determine whether the peripheral device supports a High-Definition Multimedia Interface Consumer Electronic Control (HDMI-CEC) function, when it is determined that both (a) the peripheral device is not powered on within the threshold time, and (b) the peripheral device does not support the HDMI-CEC function, transmit, to the remote controller through the second communication unit, a power-on request for allowing the remote controller to power on the peripheral device, and when it is determined that both (a) the peripheral device is not powered on within the threshold time, and (b) the peripheral device does support the HDMI-CEC function, cause the peripheral device to be powered on by the display device through the HDMI-CEC function, wherein the peripheral device is operable to provide video signals and/or audio signals to the display device. be initialized in response to a power-on instruction received through the second communication unit from the remote controller, and after being initialized in response to the received power-on instruction, communicate with the peripheral device, through the first communication unit to determine whether or not the peripheral device is powered on within a threshold time, and if it is determined that the peripheral device is not powered on within the threshold time, determine whether the peripheral device supports a High-Definition Multimedia Interface Consumer Electronic Control (HDMI-CEC) function, when it is determined that both (a) the peripheral device is not powered on within the threshold time, and (b) the peripheral device does not support the HDMI-CEC function, transmit, to the remote controller through the second communication unit, a power-on request for allowing the remote controller to power on the peripheral device, and when it is determined that both (a) the peripheral device is not powered on within the threshold time, and (b) the peripheral device does support the HDMI-CEC function, cause the peripheral device to be powered on by the display device through the HDMI-CEC function, wherein the peripheral device is operable to provide video signals and/or audio signals to the display device.