Portable internet service system and method

A portable internet service system and a method thereof are provided to achieve peer to peer transmission for increasing radio transmission efficiency of network, wherein additional down link data transmission is omitted in up link data transmission. A portable internet service system includes a plurality of terminals(120) for transmitting up link data for radio communication, and base stations(110) receiving the up link data transmitted from the terminals, transmitting down link data to the terminals, and setting peer to peer function for peer to peer transmission between the terminals. The base station transmits control signals to the terminals for making them to transmit the up link data and control signals to receiving terminals to receive the up link data transmitted from the transmitting terminals. Routers(130) and servers(140) are connected between the base stations and the terminals wirelessly for data transmission.