In the paper, a method for analyzing molecular oscillations of the glycine, tryptophan and difenilalanine amino acids in the electric fields of the THz/IR frequency ranges has been implemented with Fourier-frequency spectrum calculation of the integral dipole moment amplitude-time realizations obtained by supercomputer modeling. The achieved results inhibited new possibilities of applying this method, supplemented the understanding of the dynamic properties of biomolecules. The method and the data obtained can be recommended in the development of nanobiotechnologies, bioelectronics, and hetero hybrid microelectronic devices with embedded biomolecular components.