Method of providing transport information and method and apparatus for using it

A method for providing traffic information and a method and an apparatus for using the same are provided to create a profit by encoding and transmitting data using an encryption key in order to restrict the reception and usage of the data and providing a module to decode the data. A control part receives encoded data containing traffic information through a broadcasting module(S802). The control part extracts an IMW(Initialization Modifier Word) and a conditional access CW(Control Word) from the received data(S804). Using the IMW and the conditional access CW, the control part creates a decoding CW(S806). Then the control part decodes the encoded data using the created decoding CW and acquires the traffic information(S808). Finally the control part outputs the acquired traffic information through an LCD part(S810).