A network game server performs exchange of data with a terminal device
employed by a user through a network. Prediction data made by a user in
respect to predicted content regarding some actual phenomenon that will
occur in the future is received from the terminal device. The received
prediction data is registered in association with the user. The
phenomenon that actually occurs in regard to the prediction data is
acquired as result data and, if the result data and the prediction data
satisfy a predetermined condition, prescribed points are awarded to the
user who created the prediction data in question and the user is provided
with value data having a prescribed value in accordance with these
points.