Research deals with changes which took part in companies due to the spreading of the Internet and the new information and communication technologies. Two questionnaries were used, using two independent samples. The first questionnair starts with questions related to the companies' computer equipment, i.e. computers, terminals, software, data-base management, use of data warehouses, and computer networks. It proceeds with questions on use of INTRANET, ISDN attachment, Internet, possession of WWW server, use of business, and on electronic exchange of data to the Agency for Payments. Questions related to electronic business incentives, including questions on state incentives follows. The second questionnair is composed of similar questions as the first one. In addition, it includes questions on telework, costs of leased lines, profitability of Internet use, satisfaction with the Internet access provider, presentation and services of the company on WWW sites, the profitability of companies' Web sites, exchange of data in the electronic format, security of computer systems, and employees and their attendance at organised courses on computer science and Internet.