This diploma thesis is focused on main and supporting business activities in the company with focus on facility management. In the theoretical part are described main terms of this topic and differences are explained. Theoretical part contains chapter Customer relationship management which is an important topic in the practical part of the work. Practical part is focused on some of the main and supporting business activities. By using software CRM, activities are more efficient because of connection between process and employees. Result of this work is proposal of work with software CRM.