Abstract: A system for providing open application programming interface (API)-based medical information may not only allow examination subjects to easily measure their blood pressures and check their accurate analysis results, but also health-care services and manufacturers of electronic apparatuses or portable medical devices may easily call an open API without developing a special algorithm and special system for analyzing a measured bio signal and estimating medical information, thereby easily providing processed medical information to users.

Abstract: There is provided a blood pressure measuring device comprising: a first heart rate measuring module configured to measure a first heart rate at a first location of an examinee's body; a second heart rate measuring module configured to measure a second heart rate at a second location of the examinee's body, wherein the first location is different from the second location, wherein a first spacing between the first location and a heart of the examinee is different from a second spacing between the second location and the heart of the examinee; and a blood pressure estimation module configured to estimate a blood pressure of the examinee based on the first and second heart rates measured by the first and second heart rate measuring modules.