An object information acquiring apparatus is used which includes a receiver including a plurality of elements each transmitting an acoustic wave, receiving an echo wave resulting from reflection of the acoustic wave by an object, and outputting an electric signal, a transmission controller that controls an intensity of the acoustic wave transmitted from each of the plurality of elements, a scanner that moves the receiver in a predetermined scanning region, and an information processor that acquires characteristics information on an inside of the object using the electric signal. The transmission controller controls the intensity of the acoustic wave in accordance with a shape of the object and a position of the receiver in the predetermined scanning region.
