A photoacoustic apparatus that improves absorption coefficient measurement accuracy by obtaining information on a subject after performing correction in accordance with amounts of light emitted to the subject includes a photoacoustic wave detection unit that detects photoacoustic waves generated from a subject when a light source irradiates the subject with light and output detection signals and a signal processing unit that performs signal processing to obtain information on the subject in accordance with the detection signals. The signal processing unit obtains information on the subject after performing correction in accordance with amounts of light emitted to the subject.
