This article narrates about petroglyphs of the Azerbaijan Republic, countries of Central and Middle Asia, and other countries of the world, representing the cultural heritage of ancient generations. The article touches on the issues concerning the necessity of preserving the rock pictures for future generations using all modern available means (printed, editions, electronic media of information, articles etc.). The article contains examples of rock pictures on which our ancestors depicted people, animals, hunting scenes, the history of their daily life, various kinds of festivities, sacred ceremonies etc. with the use of tools they had at hand. As the said petroglyphs are of different geometrical dimensions (ranging from some centimeters to some meters) one of the methods of normalizing the rock pictures through the placement of the pictures within the circle area is considered. The coordinates of the coincidence of drawing points with the circle points complement a list of informative indicators. The presence of symmetry and asymmetry in the rock drawings is treated as other informative indicators. A number of rock pictures of deer and goats of different countries were studied and their graphs of distribution density along both the OX and OY axes are given. These graphs also are one of the additional informative features of the rock pictures. Correlation analysis of the pictures against both coordinate axes has been made. A structure of the developed information retrieval system of petroglyphs of the world countries is demonstrated.