An object information acquisition apparatus includes: a probe receiving an acoustic wave generated from an object and to output a signal； a scanning unit scanning the object with the probe by changing a position of the probe relative to the object； a control unit controlling execution of acoustic wave measurement on the object； and an information acquiring unit acquiring characteristic information on the object by using the signal, wherein the control unit executes first acoustic wave measurement and second acoustic wave measurement for a predetermined region of the object, and the first acoustic wave measurement is executed within a shorter period of time than the second acoustic wave measurement, and the information acquiring unit acquires displacement information indicating displacement of the object by using a first signal acquired by the first acoustic wave measurement and a second signal acquired by the second acoustic wave measurement.
