I am working on a drupal site, which has the property of

property="dc:title" set to it so it shows in google serp as ==> Mymobile site - mobilesellers.com

but in actual the site title is set to "we sell great mobile phones buy mobiles online"

will Google count the property="dc:title" or the title which is actually present on the site while ranking the page.

Currently in serp's it is showing dc:title as the title for each page.
My team mates say that dc:title does not matter google will actually rank ur <title> when viewing a page

Please guide me