A specimen information acquisition apparatus includes a signal processor which can selectively operate in first and second modes. In the first mode, when a first group represents a group of devices among receiving devices and a second group represents at least a fraction of a group of devices other than the first group, a photoacoustic image and an ultrasonic image are obtained based on received signals from the first group and the second group, respectively. In the second mode, when a third group represents a group of devices having at least a fraction of a group of devices other than the first group and a fourth group represents at least a fraction of a group of devices other than the third group, a photoacoustic image and an ultrasonic image are obtained based on received signals from the third group and the fourth group, respectively.
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