The text consists of two different parts – theoretical and practical one. Theoretical part implies several problems regarding the application of Internet during the historical research: its significance and its positive sides, various problems a historian encounters during the course of such applications, its prospects in the future, etc. On the other hand, practical part of this text comprises the review of a number of various Internet sites significant for medieval history as well as those important for the modern history. Information about the contents and language are also given along with addresses of these sites.