1. An object information acquiring apparatus comprising: an irradiating unit configured to irradiate an object with light; a probe configured to receive an acoustic wave generated from the object irradiated with the light; a scanning unit configured to move said probe relative to the object to scan the object; an imaging region input unit configured to receive an input of a designation of an imaging region, which is a region of the object to be scanned by said probe and from which the acoustic wave is received by said probe; a generating unit configured to generate an image of an object interior on the basis of the acoustic wave received by the probe; and a display region input unit configured to receive an input of a designation of a display region, which is a region of the object whose image is generated by said generating unit and displayed, wherein said display region input unit is further configured to receive a selection as to whether to display an image of an adjacent region, on the basis of the acoustic wave received by the probe while scanning said imaging region, the adjacent region being a region adjacent to the imaging region and which has not been faced by said probe.