Improved is the control of travel speed of operation indication marker in the case that the case that the delay in detection of operation time occurs. The game machine makes the object (60) pump between the reference portions (55A, 55B) corresponding to the operation portions of online opponent players, and makes the player of the own game machine perform the operation portion at the time when the object (60) reaches the reference portion (55A). The game machine determines whether the detection delay of operation time occurs. When the delay occurs, the game machine estimates as the original distance, the distance from the object (60) to the next arrival position (R1b) assuming that the delay did not occur (the distance on the path R2-CR1b), and the display of the object (60) is corrected so that the difference between the original distance estimated and the actual distance from the object (60) to the next arrival position (the distance on the path A, C, R1b) is eliminated earlier than the operation time corresponding to the next arrival position (R1b).