An object information acquiring apparatus, comprises an irradiating unit configured to irradiates an object with pulsed light； an acoustic wave detection unit configured to detect an acoustic wave generated from the object irradiated with the pulsed light and convert the acoustic wave into an electric signal； a storage unit configured to store a normalized light fluence distribution, which is a light fluence distribution normalized for a region of a predetermined size； and a processing unit configured to acquire characteristic information on the object using the stored normalized light fluence distribution and the electric signal.
