GAME SYSTEM, TERMINAL DEVICE AND COMPUTER PROGRAM

A game system that synchronizes a game state in each of two terminal devices. A terminal device includes: an operation process unit, a history information transmission unit, and a history information process unit. Each time an operation is performed by a player PA, while displaying in the first display unit G1 the game screen corresponding to the operation, the operation processing unit accumulates operation information corresponding to the operation of the game in game history information in the history information storage unit. When transmittable by the transmission decision unit, the history information transmission unit transmits the game history information to the other terminal device. The history process unit, when receiving the game history information from the other terminal device, simulates the change of the game state of the other terminal device based on the operation information accumulated in the game history information, and displays the result of the simulation in a second display portion.