Abstract: An object is to extensively return a commission to relevant parties who contribute to a customer sending effect. When an electronic money card 6 is set to a reader/writer 5, an introducing site connection unit 61 is activated to connect a user terminal 4 to an introducing site 10. The introducing site connection unit 61 stores manufacturer information and transmits an electronic money function unit ID and the manufacturer information read from the electronic money card 6 to the introducing site 10 when connecting to the introducing site 10. An introducing server 3 connects the user terminal 4 to an affiliated store server 8 through the introducing site 10, and the affiliated store server 8 transmits purchase information to the introducing server 3 when a user purchases, e.g., a commodity at an affiliated store site.