This diploma thesis describes the Internet as a medium which offers a wide spectrum of services, information, possibilities and furthermore as an omnipotent tool for searching information. This modern medium is specified, characterized, described and defined. The diploma thesis indicates what the Internet includes and what services it offers. Main concepts and options of searching and acquiring information are indicated as well. The practical part of the diploma thesis includes realization and following evaluation of a question-form investigation, which characterizes behaviour of a Czech Internet user. The goal is to prepare a suitable question-form about the behaviour of Internet users, to distribute the question-form and to evaluate and a...