A method and system is disclosed that allows a user to easily and intuitively operate applications that require contact information, in a touch device, via a tray item associated with the contact information. The method for operating applications includes: displaying a contact tray comprised of a number of tray items based on contact information, on an execution screen; receiving an interaction to use a tray item in the contact tray; configuring an execution screen for an application based on contact information of the tray item; and operating the application based on the configured execution screen.