To efficiently make prearrangements for concretizing a wedding ceremony plan.

An arrangement support server (1) is set up, and always connected to the Internet network (2). Such an environment is constructed that an arrangement support terminal (3) disposed at the reception of a wedding hall is connected to this Internet network (2). Further, a data registration terminal (4) for registering or changing the necessary data for arrangements is disposed at the side of a supplier to the hall, and also connected to the Internet. A home terminal (5) is connected to the Internet such that a bridal couple can make arrangements without going to the hall. Under this environment all the data, for example, on dishes and costumes, which is necessary for arrangements is stored in the arrangement support server (1), and thus, the bridal couple can determine various matters based on the stored data, thereby reducing the number of actual face-to-face arrangements with a person in charge of the hall.