Apparatus and method for obtaining bio-information

An apparatus for obtaining bio-information, comprising:

• a pulse wave sensor comprising a light source and a detector, the light source configured to emit multi-wavelength light to an object, the detector configured to detect the multi-wavelength light reflected from the object;
• a force sensor configured to acquire a force information about a force applied to the pulse wave sensor by the object;
• and
• a processor configured to:
• obtain a change in volume of a blood vessel based on a difference between a value, obtained by multiplying a quantity of detected light of a first wavelength of the multi-wavelength light by a ratio of an absorbance coefficient of the first wavelength and an absorbance coefficient of a second wavelength of the multi-wavelength light, and a quantity of detected light of the second wavelength
• extract one or more features based on the change in volume of the blood vessel, and the force information about a force applied to the pulse wave sensor by the object
• obtain the bio-information based on the extracted one or more features and a predefined formula.