A method and system for providing a phone directory service to a user terminal in a mobile communication network are provided. The method includes displaying, when a search keyword for the phone directory service is input by a user, a business list including businesses corresponding to the search keyword on a screen of the user terminal, connecting a call connection with a business selected by the user among the businesses displayed on the screen, displaying at least one product image provided by the selected business on the screen during the call connection, displaying, if a desired product is selected by the user, order details for the selected product during the call connection, processing payment of the selected product during the call connection, and displaying details for the payment on the screen.