The present invention relates to a photoacoustic apparatus including a processing unit configured to obtain, for each of a plurality of timings, a light fluence with which a region of interest is irradiated, configured to weight, for each of the plurality of timings, a corresponding one of reception signal groups stored in a storage unit using a weighting factor based on the light fluence with which the region of interest is irradiated, and configured to obtain target-object information on the region of interest, based on the plurality of weighted reception signal groups respectively corresponding to the plurality of timings.
