To improve the efficiency of commodity sale (commodity purchase from the orderer's viewpoint), and to improve the physical distribution, in online shopping.

A delivery center 40 delivers a commodity group for the same deliver address to the delivery address collectively to the utmost based on delivery instruction from a virtual shopping center 10. An orderer 30 gives a temporary order of a commodity by referring to commodity information, and gives a formal order to the virtual shopping center 10 when determining his own will for purchase after close examination to the commodity intended to be purchased. The virtual shopping center 10 provides the orderer 30 with the commodity information provided by each commodity providing trader 20 through a network 500, forms RT based on the temporary order from the orderer 30, forms DT based on the formal order from the orderer 30, controls so as to realize lumped delivery of the commodity group to the same delivery address based on the DT, and executes deliver instruction based on the control to the delivery center 40.