A switch control apparatus, comprising: a first processor configured to output a first control signal for controlling an operation state of a first switch, a second control signal for controlling an operation state of a second switch, and a diagnosis signal; a second processor configured to output a verification signal for verifying the operation states of the first switch and the second switch; a diagnosing unit connected to the first switch through a first control line and to the second switch through a second control line, and configured to receive the first control signal, the second control signal and the diagnosis signal from the first processor and receive the verification signal from the second processor, the diagnosing unit being configured to output (CS1, CS2) the received verification signal or the corresponding control signal (S1, S2) to each of the first switch and the second switch through the first control line and the second control line, respectively, based on the diagnosis signal and the verification signal; characterised in that the switch control apparatus further comprises: a voltage measuring unit configured to measure voltages of the first control line and the second control line and output the plurality of measured voltage values to the first processor, wherein the first processor is configured to detect a signal flowing in each of the first control line and the second control line based on the plurality of voltage values measured by the voltage measuring unit and diagnose based on the detected signal whether the first switch and the second switch are controllable. a first processor configured to output a first control signal for controlling an operation state of a first switch, a second control signal for controlling an operation state of a second switch, and a diagnosis signal; a second processor configured to output a verification signal for verifying the operation states of the first switch and the second switch; a diagnosing unit connected to the first switch through a first control line and to the second switch through a second control line, and configured to receive the first control signal, the second control signal and the diagnosis signal from the first processor and receive the verification signal from the second processor, the diagnosing unit being configured to output (CS1, CS2) the received verification signal or the corresponding control signal (S1, S2) to each of the first switch and the second switch through the first control line and the second control line, respectively, based on the diagnosis signal and the verification signal; characterised in that the switch control apparatus further comprises: a voltage measuring unit configured to measure voltages of the first control line and the second control line and output the plurality of measured voltage values to the first processor, wherein the first processor is configured to detect a signal flowing in each of the first control line and the second control line based on the plurality of voltage values measured by the voltage measuring unit and diagnose based on the detected signal whether the first switch and the second switch are controllable. a voltage measuring unit configured to measure voltages of the first control line and the second control line and output the plurality of measured voltage values to the first processor, wherein the first processor is configured to detect a signal flowing in each of the first control line and the second control line based on the plurality of voltage values measured by the voltage measuring unit and diagnose based on the detected signal whether the first switch and the second switch are controllable.