An apparatus and method for determining contents information corresponding to a Rights Object (RO) by transmitting information on contents together when the RO is moved from a mobile device to a memory card or a smart card or when the RO is moved from the memory card or the smart card to the mobile device are provided. The apparatus includes a meta information manager for determining information on contents corresponding to the RO when the RO is moved, and for generating meta information containing the determined contents information, and a controller for providing control to transmit the RO and the meta information generated by the meta information manager to a portable storage device. Accordingly, the conventional problem can be solved in which information on contents cannot be determined by using a Contents IDentifier (CID) if the RO does not exist together with the contents.