The diploma thesis deals with the assessment of the state of the information system in the selected company and the subsequent proposal of changes. The introductory part is devoted to the description of the theoretical basis for understanding the topic. In the second part, the company is introduced, its internal, external and competitive environment is analyzed and the state of the information system is evaluated. The last part is devoted to the creation of a proposals to improve the efficiency and security of the information system and a summary of costs and benefits of the proposals.