A system comprising: an electronic apparatus having a connector, and a cable connected to the connector of the electronic apparatus, the cable incorporating a differential signal line constituted of a first signal line and a second signal line, and a resistor connected between the second signal line and another terminal constituted by a power supply (Vcc), wherein said resistor is a first pull-up resistor provided on the second signal line wherein the electronic apparatus further comprises: a comparison means to compare, with a predetermined reference voltage (Vref), a voltage at the second signal line detected via the connector when the cable is connected to the connector; a discrimination means for discriminating whether or not the cable is connected to the connector based on a result of the comparison; and a capacitor (905, 906) arranged to connect in series to each of the first signal line and the second signal line when the cable is connected to the connector; wherein the comparison means includes a second pull-up resistor and a first pull-down resistor that are arranged to connect to the first signal line, and to form a first voltage divider configured to bias the first signal line, when the cable is connected to the connector, a second pull-down resistor configured when the first cable is connected to said connector to form, with said first pull-up resistor of the second signal line, a second voltage divider configured to bias the second signal line, and a comparator to compare, with the reference voltage (Vref), the voltage at the second signal line detected via the connector when the cable is connected to the connector. an electronic apparatus having a connector, and a cable connected to the connector of the electronic apparatus, the cable incorporating a differential signal line constituted of a first signal line and a second signal line, and a resistor connected between the second signal line and another terminal constituted by a power supply (Vcc), wherein said resistor is a first pull-up resistor provided on the second signal line wherein the electronic apparatus further comprises: a comparison means to compare, with a predetermined reference voltage (Vref), a voltage at the second signal line detected via the connector when the cable is connected to the connector; a discrimination means for discriminating whether or not the cable is connected to the connector based on a result of the comparison; and a capacitor (905, 906) arranged to connect in series to each of the first signal line and the second signal line when the cable is connected to the connector; wherein the comparison means includes a second pull-up resistor and a first pull-down resistor that are arranged to connect to the first signal line, and to form a first voltage divider configured to bias the first signal line, when the cable is connected to the connector, a second pull-down resistor configured when the first cable is connected to said connector to form, with said first pull-up resistor of the second signal line, a second voltage divider configured to bias the second signal line, and a comparator to compare, with the reference voltage (Vref), the voltage at the second signal line detected via the connector when the cable is connected to the connector. a comparison means to compare, with a predetermined reference voltage (Vref), a voltage at the second signal line detected via the connector when the cable is connected to the connector; a discrimination means for discriminating whether or not the cable is connected to the connector based on a result of the comparison; and a capacitor (905, 906) arranged to connect in series to each of the first signal line and the second signal line when the cable is connected to the connector; wherein the comparison means includes a second pull-up resistor and a first pull-down resistor that are arranged to connect to the first signal line, and to form a first voltage divider configured to bias the first signal line, when the cable is connected to the connector, a second pull-down resistor configured when the first cable is connected to said connector to form, with said first pull-up resistor of the second signal line, a second voltage divider configured to bias the second signal line, and a comparator to compare, with the reference voltage (Vref), the voltage at the second signal line detected via the connector when the cable is connected to the connector. a second pull-up resistor and a first pull-down resistor that are arranged to connect to the first signal line, and to form a first voltage divider configured to bias the first signal line, when the cable is connected to the connector, a second pull-down resistor configured when the first cable is connected to said connector to form, with said first pull-up resistor of the second signal line, a second voltage divider configured to bias the second signal line, and a comparator to compare, with the reference voltage (Vref), the voltage at the second signal line detected via the connector when the cable is connected to the connector.