I\'m creating a custom browser application. apart from the sites visited from my browser, i\'d like to show the history of the sites visited from safari browser as well
Simply put, you cannot. The history is stored in a property list outside of your applications sandbox and you cannot access it.
On the jailbroken side, there is a History.plist located at /private/var/mobile/Library/Safari
/private/var/mobile/Library/Safari