A biological information processing apparatus and a biological information processing system. The biological information processing apparatus includes a setter configured to obtain a plurality of pieces of biological information and to set a reference used for discrimination of the plurality of pieces of biological information based on a feature amount calculated for each of the pieces of biological information, and a calculator configured to perform addition average of, among the obtained plurality of pieces of biological information, pieces of biological information that have been discriminated based on the reference. The biological information processing system includes a biological information detecting apparatus and the biological information processing apparatus.