This study deals with more practical problems in Internet Trade. I considered the forms and contents of the offers on the current domestic and foreign web sites and clarified the legal characteristics of the web sites. As I pointed out, there are some problems of the offers of current web sites. So I suggested the alternatives. I have the view that the offers of current web sites titled by a host are not the firm offers but the invitation to offers. So, to make an enforceable agreement between parties, the host has to confirm the order. From the point of this view, it is reasonable to call the current offer on the web site the sub-con offer.