Integrate ddmegamenu in drupal menu There is a menu plug in called ddmegamenu http://www.dynamicdrive.com/dynamicindex1/ddmegamenu.htm

I want to integrate in drupal 7 menu system. I don't know form where to begin
i tried drupal megamenu module, but it is not giving same effect as ddmegamenu.

can anyone guide me how to format menu tree to apply ddmegamenu to my theme..
Dont bother, your basically going to have create module for something like that and someones already done it. This is probably the best mega menu for drupal, just install and away you go. You can add anything you want to the dropdowns, views, blocks, etc.

http://drupal.org/project/om_maximenu