The master thesis is devoted to various types of information services and an aspect of “added value” within these services. The author maps added value in information services and tries to find a basis for achieving added value in both commercial and public sphere and in context of information systems. Based on a research carried out by the author, current situation in the Czech Republic is described. Furthermore, the thesis describes some particular examples of value-added information services and their practical use, characterizes information processing software tools and outlines trends in value added information services area. (The abstract refers to the original master thesis text.)