A device inputs blood pressure data and urinary Na/K ratio data while associating the blood pressure data and the urinary Na/K ratio data with each other. A scatter diagram representing data points decided by the Na/K ratio data and the blood pressure data associated with each other is produced on a plane formed by a first coordinate axis representing the Na/K ratio and a second coordinate axis representing the blood pressure, and sensitivity type of a subject is determined as one of predetermined four types existing actually according to a distribution of the data points in the scatter diagram. Information representing a determination result is output.
