A system for providing blood pressure information comprises: a blood pressure gauge to periodically or intermittently measure a blood pressure from a subject for 24 hours to provide base blood pressure data； and a device for generating blood pressure data for each section connected to the blood pressure gauge via a wired or a wireless communication network to generate blood pressure data for each sleeping section and active section based on the base blood pressure data provided from the blood pressure gauge. The device for generating blood pressure data for each section comprises: a blood pressure data aligning unit to align the base blood pressure data by time to generate aligned 24-hour blood pressure data； an average blood pressure calculation unit to calculate a 24-hour average blood pressure based on the aligned 24-hour blood pressure data from the blood pressure data aligning unit； a slope calculation unit to calculate a slope for each time zone defining a difference between blood pressure data of adjacent front and rear ranks in the aligned 24-hour blood pressure data as a slope； a switching point determination instrument to generate at least one sleeping-active switching point and at least one active-sleeping switching point based on the slope for each time zone； and a section data generation unit to generate sleeping section blood pressure data and active section blood pressure data based on the generated switching points. Accordingly, a switching point of a sleeping section and an active section of a subject can be accurately distinguished. Sufficient, reliable, and accurate active section blood pressure data and sleeping section blood pressure data can be generated based on the switching point.피검자로부터 혈압을 24시간 동안 주기적 또는 간헐적으로 측정하여 기초 혈압 데이터를 제공하는 혈압계； 및 혈압계와 유선 또는 무선 통신망으로 연결되어 상기 혈압계로부터 제공하는 기초 혈압 데이터를 기반으로 수면구간과 활동구간 별로 혈압 데이터를 생성하는 구간별 혈압 데이터 생성장치；를 포함하는 혈압정보 제공 시스템으로서, 구간별 혈압 데이터 생성장치는 기초 혈압 데이터를 시간별로 정렬하여 정렬된 24시간 혈압 데이터를 생성하는 혈압 데이터 정렬부와； 혈압 데이터 정렬부로
