Progressive development of information technology and increasing practise of low intensity conflict have raise information warfare as a key path to accomplish own interest and dominance over adversary through taking control over his information space. In that purpose different interest group are defining their information strategies which are accomplished using tools and techniques as a constituent part of information operations. Among those, significant roles are played by psychological operations, deception and propaganda. Along with their elementary factor -disinformation, purposely distorted, incomplete and partially or completely inaccurate information. Author of disinformation is concealed, and by using it he seeks to influence the cognitive level of the target group and lead it to make decisions harmful to them. In first part of this thesis theoretical strongholds were set up, historical development is presented along with basic concepts, goals and application of the key terms: information warfare, propaganda and disinformation. Their relation is also illustrated and how they enter everyday life in different social areas through media. By reaching out to each individual in this way, disinformadion seeks to influence its cognitive domain and, by changing perception, to shape the behavior, opinions and attitudes of the target group to which it is applied. The second part of the paper presents a research that tried to gain a deeper insight into the perception of certain social groups about the relationship of disinformation - media - user - effect. The research was conducted using a questionnaire on a sample of 90 respondents consisting of three different, equally represented, homogeneous groups. The questionnaire sought to collect data on the behavior, opinion and attitudes of respondents about the use of media, trust in them and assess the prevalence of disinformation in them and the effect of disinformation on various social areas and social processes. The research established that the population represented by the sample has perception of the ubiquity of disinformation in the media, and that it also poses a serious threat to society, democratic processes and business.