The book of the Japanese specialist discusses the principles of construction and operation of computer hardware and software, as well as computer networks. Peripheral equipment is described. Much attention is paid to the problems of automation of corporate activities and information protection. The material is presented in the form of funny illustrations. The Russian translation is published in two books. The second book describes the principles of organizing computer networks, the prospects for their development, issues related to the automation of institutions and the reliability of computer systems. For persons interested in computer technology and its applications.