Computer system and control method thereof

A control method of a computer system, comprising:

• initiating a system part into a standby mode;
• monitoring a state of a predetermined recognition signal applied from an external device by means of a control unit that is connected between a connector to which the external device is connected and a communication unit that communicates with the external device;
• and
• performing a predetermined function corresponding to the monitored state of the recognition signal,
• wherein the monitoring comprises checking whether the recognition signal is a pulse signal having a pulse voltage value of a predetermined period or a constant signal having a constant predetermined voltage value.

A computer system including a communication interface to receive an external device and including a system part operable in an operation mode and a standby mode, comprising:

• a communication unit electrically connected to the communication interface to communicate with the external device;
• and
• a control unit in electrical communication with the system part and the communication unit to detect the standby mode of the system part and to detect a recognition signal output by the external device and to perform at least one operation with the external device based on the recognition signal while the system part exists in the standby mode,
• wherein the recognition signal indicates that the external device is one of a peripheral device or a battery powered device.