To provide a sales system using the Internet capable of not only selling general commodities but also selling commodities designed by an user himself or herself.

The sales system using the Internet is constructed from a personal information registration means 3 registering and controlling personal information so that an user of the sales system can use the sales system, a commodity information supplying means 2 releasing service commodities information to an user registering personal information, an information releasing means 100 having an idea commodity collecting and registering means 4 collecting and registering idea commodity information invented by an user side, a function selecting and ordering commodities wanted to purchase among service commodity information by users, and an input and output terminal 1 having a function ordering idea commodity information registered in the idea commodity collecting and registering means 4 as service commodity information, by using an internet 200.