System for transmitting and receiving data from within a mobile unit without a constant connection to a communication network

A data transmission/reception system is capable of transmitting and receiving data even from within a moving vehicle in which a constant connection to a communication network cannot be maintained. A temporary storage server that is established inside the moving vehicle temporarily saves upload data that are received from a user terminal. The temporary storage server is provided with the capability to determine whether a state exists that allows communication with various servers. When in a state that allows communication with the various servers, the temporary storage server transmits the data that it has temporarily saved to various servers by way of a communication network. The temporary storage server further, when requested to download from a user terminal, receives the download data from various servers by way of a communication network when in a state that allows communication with the various servers. The temporary storage server then temporarily saves the download data that have been received.