In a known apparatus, when a user defines a specified region in which characteristic information is to be acquired, it may be difficult for the user to easily recognize a corresponding scanning region that is to be actually scanned with a receiver. An embodiment of the invention provides an object information acquisition apparatus including a receiver configured to receive an acoustic wave and convert it into an electric signal, a scan control unit configured to scan the receiver at least in one direction, and a display control unit. Upon receiving information associated with a region specified to be scanned to acquire characteristic information, the display control unit outputs information for displaying an adjusted region obtained by adjusting the specified region such that a length of the specified region in a first direction corresponds to an integral multiple of a scanning width of the receiver in the first direction.
