An apparatus includes a plurality of acoustic detectors detecting an acoustic wave from an object and outputting an electric signal, including a first and a second acoustic detectors each having a first and a second frequency sensitivity characteristics to output a first and a second electric signals, the first and the second frequency sensitivity characteristics are different, a memory holding a correction function created based on a third frequency sensitivity characteristics obtained from the first and the second frequency sensitivity characteristics, and an information processor correcting the first and the second electric signals using the correction function, thereby acquiring corrected electric signals and generating image data representing object information.
