A blood pressure measurement apparatus for determining a level of rareness of raw data and transmitting the raw data to a gateway or a server according to the determined level of the raw data includes a blood pressure estimator configured to acquire raw data for estimating blood pressure, and to estimate blood pressure from the raw data according to a blood pressure estimation algorithm and a controller configured to determine a level of rareness of the raw data, and to determine whether to transmit the raw data according to the determined level of rareness of the raw data.