An Ethernet-based image transmitting device comprising: a signal processing unit configured to transform an analog image signal received from an image sensor into a digital signal comprising a luminance signal and a chrominance signal; a medium access control module; a physical module; a control unit configured to multiplex the luminance signal and the chrominance signal to generate a multiplexed signal having synchronization information, the control unit comprising: a multiplexing unit configured to multiplex the luminance signal and the chrominance signal; a first memory configured to temporarily store the multiplexed signal, wherein the temporarily-stored multiplexed signal is output by the medium access control module in synchronization with a transmission clock signal of the physical module; and a second memory configured to temporarily store a control signal received in synchronization with the transmission clock signal of the PHY module via the Ethernet cable and then output the control signal in synchronization with an internal clock signal; wherein: the MAC module is configured to generate a packet including: at least one multiplexed signal including the multiplexed signal, and image resolution information; the PHY module is configured to transmit the packet in an Ethernet transmission format via an Ethernet cable; and wherein the Ethernet-based image transmitting device further comprises: a compression unit configured to compress the luminance signal and the chrominance signal if a bandwidth of the multiplexed signal exceeds an Ethernet transmission bandwidth according to an image resolution; and further wherein the Ethernet cable is an unshielded twisted pair cable. a signal processing unit configured to transform an analog image signal received from an image sensor into a digital signal comprising a luminance signal and a chrominance signal; a medium access control module; a physical module; a control unit configured to multiplex the luminance signal and the chrominance signal to generate a multiplexed signal having synchronization information, the control unit comprising: a multiplexing unit configured to multiplex the luminance signal and the chrominance signal; a first memory configured to temporarily store the multiplexed signal, wherein the temporarily-stored multiplexed signal is output by the medium access control module in synchronization with a transmission clock signal of the physical module; and a second memory configured to temporarily store a control signal received in synchronization with the transmission clock signal of the PHY module via the Ethernet cable and then output the control signal in synchronization with an internal clock signal; wherein: the MAC module is configured to generate a packet including: at least one multiplexed signal including the multiplexed signal, and image resolution information; the PHY module is configured to transmit the packet in an Ethernet transmission format via an Ethernet cable; and wherein the Ethernet-based image transmitting device further comprises: a compression unit configured to compress the luminance signal and the chrominance signal if a bandwidth of the multiplexed signal exceeds an Ethernet transmission bandwidth according to an image resolution; and further wherein the Ethernet cable is an unshielded twisted pair cable. a multiplexing unit configured to multiplex the luminance signal and the chrominance signal; a first memory configured to temporarily store the multiplexed signal, wherein the temporarily-stored multiplexed signal is output by the medium access control module in synchronization with a transmission clock signal of the physical module; and a second memory configured to temporarily store a control signal received in synchronization with the transmission clock signal of the PHY module via the Ethernet cable and then output the control signal in synchronization with an internal clock signal; wherein: the MAC module is configured to generate a packet including: at least one multiplexed signal including the multiplexed signal, and image resolution information; the PHY module is configured to transmit the packet in an Ethernet transmission format via an Ethernet cable; and wherein the Ethernet-based image transmitting device further comprises: a compression unit configured to compress the luminance signal and the chrominance signal if a bandwidth of the multiplexed signal exceeds an Ethernet transmission bandwidth according to an image resolution; and further wherein the Ethernet cable is an unshielded twisted pair cable. the MAC module is configured to generate a packet including: at least one multiplexed signal including the multiplexed signal, and image resolution information; the PHY module is configured to transmit the packet in an Ethernet transmission format via an Ethernet cable; and wherein the Ethernet-based image transmitting device further comprises: a compression unit configured to compress the luminance signal and the chrominance signal if a bandwidth of the multiplexed signal exceeds an Ethernet transmission bandwidth according to an image resolution; and further wherein the Ethernet cable is an unshielded twisted pair cable. a compression unit configured to compress the luminance signal and the chrominance signal if a bandwidth of the multiplexed signal exceeds an Ethernet transmission bandwidth according to an image resolution; and further wherein the Ethernet cable is an unshielded twisted pair cable.