An apparatus and method for precisely measuring various biological
information of a user's body by using a single measuring apparatus enable
precisely and effectively measuring biological information including body
fat, pulse and a blood vessel aging degree. By measuring an infrared
absorbance or infrared rays irradiated to a measurement target according
to a modulation and tuning method and obtaining the information with
reference to supplementary biological information obtained from a user,
the plurality of biological information can be precisely measured at a
low driving voltage through the modulation and tuning method by using a
single infrared light source. Also, the measuring apparatus can be
reduced in size by simplifying its construction and can be effectively
integrated into various device.