To provide a lottery system and its method improving the interest for the posted advertisement or information by increasing the number of access during a response period.

A lottery server 10 and user terminals 20 are connected via the Internet 100 to form this lottery system. Each user terminal 20 gains access to the home page managed and operated by the lottery server 10, confirms the response gist transmitted from the lottery server 10, and transmits the response information in a time slot having the best winning state after confirming the present winning state. An applicant can transmit the response information in the time slot expected to have the highest winning possibility while confirming the present winning state. Since the number of access for confirming the winning state is increased, the profit of a sponsor derived from the number of users utilizing the lottery system and the provision of advertisement can be increased.