A mobile communication system is disclosed which comprises: an information terminal unit; a plurality of mobile stations, each of which communicates with the information terminal unit; a packet mobile switching center which communicates with the plurality of mobile stations through a radio access network; a packet mobile gateway switching center which communicates with the packet mobile switching center through a mobile data network; and a content server which communicates with the packet mobile gateway switching center through the Internet; wherein the information terminal unit downloads or uploads data from or to the content server through the plurality of mobile stations.