An online object reservation system includes a database and an object reservation server. The database stores multiple objects associated with individual selection status. The object reservation server establishes a continuous connection with a client to provide a reservation page and receive reservation requirements from the client. The object reservation server automatically selects connection objects according to the reservation requirements. The object reservation server also establishes other connections with other clients. Whenever the selection status of any of the objects is altered, the object reservation server sends a refresh notification to the client to update contents rendered on the reservation page.