An IBM PC compatible information retrieval system (IRS) for spectral characteristics of the atmospheric and trace gases in wide frequency and temperature ranges is described. A model and logical structure of an open software environment for the multifunctional IRS which generates data banks problem-oriented (spectral line parameters, absorption coefficients, molecular constants, etc.) have been developed. The structure of the IRS is arranged according to indexed sequential method as it is recommended for network data-base management system. Special attention we pay to the IRS architecture and man-machine interface. We also propose the ways of arranging data banks of IRS and some possible operations with databases on the experimental and recommended values of spectral line parameters and with the archives of molecular and spectroscopic constants. It is emphasized that relational and associative relationships dominant in this IRS.