A photoacoustic apparatus includes a light irradiation unit configured to irradiate a subject with light, a reception unit configured to convert an acoustic wave generated from the subject due to the irradiation with the light into an electric signal, a processing unit configured to acquire image data using the electric signal, and a display control unit. The processing unit acquires first image data by a first image generation method using the electric signal, and acquires second image data by a second image generation method different from the first image generation method using the electric signal. The display control unit sets, as a difference region, a region in which difference image data between the first image data and the second image data has an image value within a predetermined numerical range, and causes image data in which the difference region and another region are distinguishable from each other to be displayed on a display unit using the first image data and the second image data.
