This article is focused on analysis of the importance of business communication in SME and its role to support and increase their business efficiency. It is necessary to communicate effectively and collaborate with teams and partners. Simplified ways of information sharing between people are very important for doing business and so it is possible to integrate communication with business processes. Unified communications help to solve a lot of problems, because companies as well as their partners have limited resources - so they must look for simple solutions to manage common communication processes more effectively. It is required to create an opened and optimized communication structure that supports on-line exchange of information necessary to make and operative decision-making and managing processes more flexible. The final result is that a business is run faster and smoother. To make a communication process more effective it is essential to decide where closed areas or risky points of information processing are and evaluate what to do to optimize such communication process. Communication network in any enterprises has unique properties since it is a socio-technical system that is created by people with their specific characters, but not only by exploitation of technical components but also through other communication tools. We implemented a concept of social network methodology where we used a graph diagram-method combined with matrix correlation analysis based on mathematics modelling of such network. We present methods and tools designed to detection and computing of centralities (closeness, degree and betweenness centralities) as well as network density. By setting these centralities we can visualize a social network structure of common businesses communication systems. Business efficiency could be increased due to better information about properties and closed appointments of an analyzed enterprise structure.