There is provided a data transmitting system for transmitting data to be
processed through a TCP/IP-based network. The data transmitting system
includes a first device having an identification information obtaining
system that transmits first data through the network using a first
multicast address, and a data transmitting system that transmits the data
to be processed through the network using a second multicast address. The
data transmitting system further includes a second device having an
identification information transmitting system that transmits second data
containing the identification information of the second device through
the network using a third multicast address, and a data receiving system
that receives the data to be processed.