To distribute transmission data to a plurality of lines in consideration of business characteristics when transmitting data for a plurality of businesses over a plurality of communication lines.

A data transmission system comprises; a single order processing part 11 for issuing single order requests; a basket order processing part 13 for issuing basket order requests; and data transmission parts 20 in one-to-one correspondence with communication lines L1 to L4. Single and basket order requests differ in peak hours of issuance. In the data transmission parts 20 and 20, priorities for single orders and for basket orders are assigned, and the two top priorities are different data transmission parts 20. The single order processing part 11 and basket order processing part 13 select the data transmission parts 20 according to the prioritization in issuing requests.

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