To provide an operation managing system for net contest type simulation games which can be carried out between users combining E mails by connecting mobile computing devices to the Internet.

In the operation managing system for net contest type simulation games combining E mails by using the mobile computing devices and servers through the Internet, there are arranged a step for previously registering users' personal data desiring for contests at servers, a step in which candidates for the contests are selected from among the registered users to determine initial and late attackers A and B and the results are notified by E mails, a step in which the initial attacker A is asked to access a starting animation URL by the E mail so that the starting screen of the game is displayed on his mobile computing device, a step in which upon the end of the turn of the initial attacker A, the later attacker B is asked to access a proceeding screen URL by the E mail so that the proceeding screen is displayed on the his mobile computing device, a step which after the end of the turn of the late attacker B, a return is made by the initial attacker A and the steps as mentioned above are repeated and a step in which after the end of a plurality of turns, winning or losing is determined to notify the initial and later attackers A and B of the result by the E mail.