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? (Is it talking about choosing one approach between Qualitative, Quantitave, etc. approaches? If so, is it enough to just write down the name and add no details?)
You can't really choose your topic definitively until you have "mastered" the related material, but you can give a strong, well-informed description of what your topic might be.

A methodological approach is the approach you will take to exploring your topic. For example: "I will perform neural network simulations of the PFC and BG of a decision making agent while recording neuronal activity and behavior. I will supplement this computational approach with validation of behavioral results in humans." The approach should be carefully thought out (as the above example was not) and worded to make it sound nontrivial yet feasible within the scope of your program.