The data processing device includes an acquisition unit that acquires a plurality of pieces of the same category of bio-information about the same person. The bio-information is measured with both a licensed first device and an unlicensed second device. A judgment unit judges whether each acquired piece of bio-information acquired in the previous acquisition was measured by the first device or the second device. A display processing unit displays with different display modes on the same screen, a first data group of a plurality of pieces of bio-information judged to have been measured with the first device and a second data group of a plurality of pieces of bio-information judged to have been measured with the second device. The data processing device identifies data when data from both licensed and unlicensed devices coexist.
