Portable device for processing multimedia signal and method using the same

A portable device for processing a multimedia signal and a method using the same are provided to increase the service satisfaction of users by transmitting a decoded multimedia signal to an external display device. A multimedia signal receiver(210) receives from a mobile terminal a multimedia signal that the mobile terminal receives from a service providing sever. A decoding related information generator(220) generates decoding related information which is concerned with at least one of codec or definition. According to the decoding related information, a decoder(230) decodes the multimedia signal, and generates multimedia information. A multimedia information transmitting unit(240) transmits the multimedia information to an external display device.