An object information acquiring apparatus is provided, which includes: a light irradiator emitting with light at first and with light at second wavelength； a receiving unit receiving an acoustic wave and outputs a signal； a processing unit generating structural information and functional information； and a display controlling unit, wherein a first irradiation at the first wavelength, a second irradiation at the second wavelength, and a third irradiation at the first wavelength are performed, the receiving unit outputs first to third signals, the processing unit generates first functional information based on the first and second signals and generates second functional information based on the second and third signals.
