An event starting unit starts an event which associates characters of first and second players. An event managing unit repeatedly executes alternately a first interaction including transmission of first question information to a communication terminal and reception of first answer information from the communication terminal, and a second interaction including transmission of second question information to the communication terminal and reception of second answer information from the communication terminal. A character creating unit creates a new character based on parameters of the characters of the first and second players when the number of times of the first and second interactions reaches a predetermined value. The new character created by the character creating unit is arranged in the first and second virtual spaces.