Abstract: An entertainment system comprises parameter changing means for permitting a user to input manipulation data by successively pressing a decision button when a button icon is displayed on a display monitor. Based on the manipulation data, the parameter changing means changes damage of a virtual enemy (e.g., monster). The parameter changing means comprises button icon displaying means for displaying the button icon on the display monitor for a predetermined period of time, accumulating means for counting the number of times the decision button is pressed for inputting manipulation data when the button icon is displayed on the display monitor, and damage calculating means for changing damage of the monster based on the counted number of times.

Abstract: A button icon is displayed on a display monitor for a predetermined period of time. When the button icon is displayed on a display monitor, a user successively presses a decision button. The number of times the decision button is pressed when the button icon is displayed on the display monitor is counted and inputted to an entertainment apparatus as manipulation data. Damage of a virtual enemy (e.g., monster) displayed on the display monitor changes based on the manipulation data.