1. An object information acquisition apparatus configured to receive an acoustic wave from an object and acquire characteristic information of the object, comprising: a receiver configured to receive the acoustic wave and convert the received acoustic wave into an electric signal; a scan control unit configured to scan the receiver at least in one direction; and a display control unit configured to produce, using information associated with a specified region defined by a user as a region in which characteristic information is to be acquired, guide information for displaying a guide on a display unit in terms of the number of times the receiver is scanned in a first direction.