The expansion of geographic information systems contributes to the development of an information society that increasingly uses geoinformation data in all areas of life. GIS also enters the economic and scientific realm of the real estate market, slowly displacing analogue price registers and real estate values. With the use of GIS tools, many issues in this area (e.g. sales / purchase, rental, average sales prices) can be presented on maps, and the wide database provides many possibilities for carrying out a variety of analyses. The aim of this article is to use the selected GIS technology to analyse the value of real estate in Kołobrzeg. Using the secondary data from the price and property register spanning the years 2013–2016 the value of undeveloped land has been analysed. The analysis was presented by two different methods: cartodiagram and cartogram, and then the results were compared and interpreted. The maps that were developed during the process of analysis provide accessible information about the distribution of real estate values for property valuers as well as potential buyers and sellers.