Information recording and reproducing apparatus, etc.

Quickly the optical medium 2 having a plurality of recording layers, and properly record predetermined information, or provide Playable information recording and reproducing apparatus or the like. Information recording and reproducing apparatus 10, when recording predetermined data in the first layer of the optical medium 2, the detection unit for detecting the recording state of radial region of the optical medium 2 relative to the rotational angle of the zeroth layer includes a 13, a predetermined recording data by controlling the power of the light beam emitted to the first layer by the recording power control unit 18 records or reproduces, based on the detection result.