A recording and reproducing apparatus of an optical recording medium has a plurality of light sources. A plurality of light beams are radiated by a laser diode array to a track of the optical recording medium, and each of the plurality of light beams reflected by the track is detected by a photodiode and converted into an electrical signal. The laser diode array is arranged such that the beam spots of adjacent ones of the plurality of light beams cross a track direction of the optical recording medium and a track width direction perpendicular to the track direction. The signal detected by the photodiode is converted into an electrical signal and recorded in a frame memory as data corresponding to the signal. The digital data stored in the frame memory is read out by a two-dimensional decoder.