The present invention frequency domain in-plane or of out-of-plane ultrasound propagation imaging apparatus and method, a frequency-domain in-plane ultrasound propagation imaging apparatus, and a laser beam irradiation unit for irradiating the generated pulsed laser beam at a predetermined irradiation repetition rates, wherein the irradiation of pulse laser and a beam splitter to separate the beam into a plurality of pulsed laser beams transmitted to a plurality of areas on the outer surface of the target object, the laser mirror scanner for reflecting the passed pulse laser beam into a plurality of irradiation points on the plurality of regions, and the If the reflected pulse laser beam, the transmission through the outer surface and the ultrasonic waves are generated by the transmission pulse laser beam propagating in the in-plane (in-plane) of the target object, the contact with the electric wave ultrasonic-type or non-contact laser ultrasonic sensor with a pitch-catch mode, a received (pitch-catch mode) and the time for the amplitude of the received ultrasonic Receiving a real-time processing to the signal processing and the processing of signal frequency transformation, and the frequency and re-converted signal into a signal of the three-dimensional data structure in which signals of the frequency band amplitude in the plurality of irradiation points, the reconstructed 3-D by dividing the signals of the data structure for each frequency in-plane (in-plane) ultrasonic frequency and generate a divided image and an output image processing unit for, that the laser beam irradiation section, and the control to generate a pulsed laser beam with the predetermined irradiation repetition rate, the laser constitute a control section for controlling the scanner mirror to reflect the pulsed laser beam into a plurality of the irradiation point of the predetermined interval.