A portable computer includes a main body equipped with a main board with a CPU, and a power supply supplying electric power to the main board, the portable computer further including a wireless communicating part including an RF transmitting and receiving part provided at the main body, electrically connected to the main board, and wirelessly transmitting and receiving predetermined data using an RF signal, and an AD converter converting an analog signal received through the RF transmitting and receiving part into a digital signal and transmitting the digital signal to the CPU, and converting a digital signal from the CPU into an analog signal and transmitting the analog signal through the RF transmitting and receiving part. The portable computer further includes a connector electrically connected to the power supply and delivering electric power from the power supply to the wireless communicating part, a wireless modem software program operating the wireless communicating part, and a control part controlling the connector to deliver electric power from the power supply to the wireless communicating part so as to operate the wireless communicating part when the wireless modem software program is executed in order to operate the wireless communicating part. Accordingly, the portable computer is capable of wireless data communication without an extra peripheral unit.