wordpress site on main domain using data from its blog database

Hi All, As i have a requirement from client he wants to display the contents in a different way on main domain say “domain.com” using the data from the existing blog say “blog.domain.com”,Now nothing is installed on domain.com and wordpress blog is there on blog.domain.com, Kindly let me know the right way of getting contents as same as blog.domain.com so that client can use it as he wants.