What's a "methodological approach" for research (Master's thesis)?

I'm going to apply for a Master's program. Although I'm not going to change my general field of study, I'm going to change my 'track' (from Information Technology to Geoinformatics).

In the application form of the aforementioned Master's program, I've been asked to specify my area of interest and state a research topic for my Master's thesis and describe my methodological approach. I honestly have no idea how to fill this part, how can I choose an area of interest and more importantly a topic for my thesis when I haven't even started the studies? Besides, can someone please kindly tell me what the part about the "methodological approach" means?