According to an aspect of the present invention, there is provided a blood pressure measuring apparatus including a pressure sensor unit configured to sense an atmospheric pressure, an applied pressure, and a blood pressure of a blood vessel delivered to a skin and output an electrical signal indicating a result of sensing the pressures, while in contact with the skin a signal division unit configured to receive the electrical signal and divide the electrical signal into a divided electrical signal which includes a direct current (DC) signal and an alternating current (AC) signal a signal processor unit configured to process the divided electrical signal and a blood pressure calculation unit configured to calculate the applied pressure using the processed electrical signal and calculate a blood pressure average using the calculated applied pressure and a swing value of the electrical.
