Disclosed is a game system provided with a monitor for displaying and outputting a game screen, a touch panel overlaid upon the monitor, and an external storage device for storing sequence data wherein operation time periods of the touch panel during a game are described. The sequence data includes an object corresponding to a specific operation time period for which the time interval between the following operation time period is to be less than a predetermined value, and display start information for setting a display start time period which is earlier than the following operation time period. In addition, the game system, on the basis of the sequence data, associates a second object separate from a first object corresponding to the following operation time period with the specific operation time period to cause display to start earlier than the following operation time period.