The invention provides a document data transmission device to swiftly transmit information that a user needs. The document data transmission device includes a storage unit that stores plural document data pieces and plural summary data pieces including contents information, a page data transmission request receiving unit that receives a page data transmission request transmitted from a user terminal, a page data transmitting unit that transmits specific page data of specific document data to the user terminal through a satellite network on the basis of the page data transmission request, a summary data transmission request receiving unit that receives a summary data transmission request transmitted from the user terminal, and a summary data transmitting unit that transmits specific summary data to the user terminal, on the basis of the summary data transmission request.