Convert From Vivvo to wordpress

Hello,
I’m now designing a new website using wordPress, but the owner wants from me to import all his old data to the new website, so he gave me the database and the access for the old website, The problem is that the old website was built on a tool called vivvo, I do not have any idea about it, so please can anyone help me to import the data to the new site, and how to convert the old categories into a new one???
Thamks