An object information acquiring apparatus, including: a probe converting an acoustic wave generated from an object irradiated with light into a detection signal and a signal processing unit generating information about the object from the detection signal, wherein the signal processing unit: extracts a sampling signal on the basis of conditions relating to the signal shape generates a reference signal from the sampling signal detects a phase-inverted signal, which is a portion of the detection signal where the phase is inverted with respect to the reference signal, by carrying out a correlation calculation generates a signal after suppression by suppressing the intensity of the phase-inverted signal from the detection signal and generates information about the interior of the object using the signal after suppression.
