An object information obtaining apparatus is used which includes: an irradiator； a transmitting element transmitting an ultrasound wave； a receiving element receiving an acoustic wave； a signal processor； an information processor； and a controller, wherein the signal processor generates a photoacoustic signal and an ultrasound echo signal, the information processor obtains photoacoustic characteristic information and ultrasound characteristic information including information related to blood flow, and the controller controls, in accordance with the blood flow, at least one of light irradiation, generation of the photoacoustic signal, and obtaining of the photoacoustic characteristic information.
