Research on the diversity in the context of internationalization process is rare. Our purpose of this thesis is to conduct a good understanding on diversity of internationalization process in telecommunication industry. Based on Uppsala Internationalization Model (U-Model) of Johanson and Vahlne (1977), we applied a qualitative research method, primary and secondary data collection to perform an empirical study. Afterward we discuss about how organizational diversity, marketing strategy diversity and diversity of core values on Ericsson show up in the process of internationalization. In the conclusion, we put forward our comments on the research problems. Then we also issued a direction on further research.