An object information acquiring apparatus is used, which includes: a receiver configured to receive a photoacoustic wave generated from an object irradiated with light and output a time-series electric signal and a processor configured to acquire characteristic information relating to an inside of the object by using the time-series electric signal, wherein the light is emitted at a plurality of timings, the receiver receives the photoacoustic wave at the plurality of timings, and the processor determines a projection position coordinate on which the time-series electric signal is projected on the basis of an amount of displacement of the inside of the object among the plurality of timings, for each of a plurality of time-series electric signals corresponding to the plurality of timings, and acquires the characteristic information.
