It is sometimes difficult for an operator who is not well familiar with an apparatus to acquire a desired image.An object-information acquisition apparatus includes a light source configured to emit light, a photoacoustic-wave detecting unit configured to detect photoacoustic waves generated when the light is applied an object, a measurement-mode selecting unit, and a measurement-condition determination unit configured to determine at least one of measurement conditions including a wavelength of the light to be emitted by the light source and a central reception frequency of the photoacoustic-wave detecting unit on the basis of the measurement mode selected by the measurement-mode selecting unit.
