an object information acquiring apparatus comprises a light emission unit configured to emit light beams from a plurality of emission positions； a conversion unit configured to convert acoustic waves generated when an object is irradiated with the light beams emitted by the light emission unit into electric signals； a beam profile acquisition unit configured to acquire information relating to beam profiles of the light beams emitted by the light emission unit, the beam profiles corresponding respectively to the plurality of emission positions； and a characteristic information acquisition unit configured to acquire characteristic information of the object on the basis of the information relating to the beam profiles corresponding to the plurality of emission positions and the electric signals.
