To provide useful services for visitors when dynamic events such as a parade are implemented whose implementation positions change in time series in a theme park.

A server 2 produces congestion information expressing how the periphery of a predetermined position for implementing a parade is congested with portable terminals 8 in association with positional information received from the terminals 8 and information on predetermined parade implementation such as predetermined time and position for the implementation, and transmits the congestion information to the terminals 8. When each terminal 8 receives the congestion information from the server 2, it displays the received information on a display 10 (for example, the route of the parade is indicated by 'arrow P', an area congested to 'a large degree' by 'mark ', an area congested to 'a medium degree' by 'mark ', and an area congested to 'a small degree' by 'mark '). The theme park operating party can inform the visitors carrying the terminals 8 how the periphery of the predetermined position for implementing the parade is congested with visitors.