t components and 2 t components can be kept constant in the agc circuit 29 agc is applied in the frequency band of the distortion components due to interlayer crosstalk of the upper envelope signal of 8 t components in the rf signal as a result direct influences are not exerted on the rf signal in a frequency band far higher than the frequency band of the distortion components due to interlayer crosstalk of the upper envelope signal therefore in the optical information recording and reproduction apparatus 20 since the signal can be binarized by the agc circuit 29 on the basis of the rf signal in which influences due to interlayer crosstalk are eliminated the reproduction result can be accurately reconstructed according to the above construction by applying agc to the rf signal containing dc components the envelope of the rf signal becomes constant to eliminate distortion due to interlayer crosstalk in advance and the reproduction result can be accurately reconstructed on the basis of a rf signal in which the distortion is eliminated although the above embodiment describes a case in which the agc circuit 29 is provided between the matrix computation circuit 21 and the rf signal processing circuit 30 the present invention is not limited to this embodiment and the agc circuit 29 may be provided between the matrix computation circuit 21 and the servo signal processing circuit 22 as a result in the optical information recording and reproduction apparatus 20 servo control can be performed accurately although the above embodiment describes a case in which the upper envelope signal uev 1 is extracted on the basis of the peak level of the 8 t components of the rf signal by the peak hold circuit 43 of the.