To provide an event planning system capable of realizing an attractive event as a breakthrough in an undifferentiated event plan and offering financial support to a user selling commodities at the event.

An event planning server 200 for planning an event and a financial server 2, which is used for payment in advance of buying money and the like to a user opening a shop at the event, are connected to the Internet 201 with a personal computer 204 and the like serving as a user terminal. The user can propose a new plan or ask participation to the event via the webpage of the event planning server 202, while a planning company side responds to the user through correction and the like in the database. When a payment route allowing deposit of money to sale from a department store is used on the planning company side, payment in advance of the buying money and the like can be carried out without requiring any security from the user.