With the aid of a "case study" research design, this thesis analyses the typology of informational services, whose prudent application can influence relations of institutions existing within the drama industry with the broader public. The theoretical part sheds light on the problematic definition of "information services", which is placed in the context of online marketing, and introduces ways, in which this term possesses an added value in the form of affecting the applied processes of public relations within particular institutions. Secondly, it includes basic methodological perspectives on quantitative research, the rules of performing case study research as the selected research design, and last but not least, it describes utilised methods of data collection. The last and most key part of the thesis is based on resulting application of the typology of information services, discussed in the previous parts, and concerns itself with the aforementioned question of their influence on public relation processes of individual institutions. These include the information portal divadlo.cz, which serves caters for the domestic sphere of theatre, and an official web presentation of the Divadlo na Zabradli theatre. The analysis is of inductive nature and is not directed by a previously determined...