The invention relates to a data transmission device, a read data transmission device and a data transmission method. A data transmission device includes: a sending unit that sends data according to one of a plurality of communication protocols; a data obtaining unit that obtains data; a communication address obtaining unit that obtains plural communication addresses assigned to a destination to which the obtained data is to be sent; a determining unit that determines a communication protocol to be used for sending the obtained data to the destination from among one or more communication protocols that are included in the plural communication protocols to which the sending unit is adapted, and that correspond to one of the obtained plural communication addresses; and a transmission controlunit that causes the sending unit to send the obtained data according to the determined communication protocol to a communication address corresponding to the determined communication protocol, the communication address being included in the obtained plural communication addresses.