A photoacoustic apparatus includes a light source, a plurality of receiving elements that receive a photoacoustic wave generated as a subject is irradiated with light emitted from the light source and output time-series reception signals, a signal data acquisition unit that generates reception-signal data based on the time-series reception signals and store the reception-signal data, and an information acquisition unit that acquires information on the subject based on the reception-signal data stored in the signal data acquisition unit.
