For recording analog information, a voltage is applied to a ferroelectric material plate as a synchronizing signal, the voltage having an amplitude equal at least to that of the threshold voltage for switching the polarization of the ferroelectric material plate and having a time width which is greater than the switching period of the polarization of the ferroelectric material, corresponding to the amplitude. A quantity of switching charge is modulated in proportion to the gradation of the analog information signal, the switching charge flowing through an external circuit which is connected in series with a ferroelectric material plate.