Abstract: The network system configured of a ticket issuing center, a payment center, and an entrance gate, interconnected with a network. The system notifies the user terminal of a plurality of first data, in response to a request from a user terminal connectable to the network. Each of the plurality of first data includes a site, an admission time, and a price for admission. When receiving the second data selected among the plurality of first data, the third data, and the fourth data representing an account for payment, the system makes a payment with the fourth data. After completion of the payment, the system receives a notification of the fifth data from the user terminal connectable to the network on an admission time to the site included in the second data. Thus, when the fifth data coincides with the third data, the system permits the owner of the user terminal to pass through the entrance gate installed in the site corresponding to the site data contained in the second data.