The main objective of master thesis is to analyse the selection of negative stories in TV news of chosen commercial TV broadcaster with a focus on the relationship between negative stories and the impact of advertisement. At the beginning, the theoretical analysis devotes to mass media and matters related to audience, the media influence, and historical development of views on media content. After that, the next part is dedicated to TV news. The research has been based on the analysis of documents, in-depth interviews and the analysis of previous study. They have helped to find the answers on the problematic questions that are to find in the last overview chapter. The master thesis provides one of possible views on TV news of commercial TV broadcaster and can lead to thinking about the influence of negative news on advertiser in the commercial break.