PURPOSE: To record at high speed without damaging a recording film and to record a moving image and sound information, by assigning the function of information erasure to one of two light spots and the function of information recording to the other spot, respectively.

CONSTITUTION: While holding the constant interval between two light spots 11, 12, the irradiating positions are moved to a peripheral side by the interval corresponding to one pitch of a track at every one revolution of a magneto- optical disk 1. At this time, when the second light spot 11 irradiates at an erasure level while inverting the direction of applied vertical magnetic field at every one revolution of the magneto-optical disk 2, the information of the track is erased successively in order to i+1th, i+2th, etc., from an ith track. In such a case, when a relation where the direction of the applied magnetic field at an erasure time and the direction of the applied magnetic field at a recording time are opposite each other is held, overwrite is performs in appearance by only the delay of one revolution.