To increase the number of vending machines in communication and elongate a data communication distance.

A plurality of groups of vending machines, consisting of first to third groups of vending machines 24 to 26, wherein a plurality of vending machines 21-1 to 21-n, 21-1 to 21-n, and 22-1 to 22-n are connected together by polarized communication lines 23-1 to 23-3, are formed. Data communications between the groups of vending machines 24 to 26 are effected in the transceiver mode of PHS modules 30 to 34, and the sales data of all the vending machines 21-1 to 21-n, 21-1 to 21-n, and 22-1 to 22-n are transmitted to a personal computer 5 through the first group of vending machines 24 among the first to third groups of vending machines 24 to 26.