To stimulate interests in chat functions in a video game.

Whether or not there is a keyword in a chat document transmitted from a video game machine is decided (S304), and when there is no keyword, screen control information, to which blow-off is added in S303, is transmitted to the video game machine (S306). However, if a chat document is transmitted from, for example, a video game machine of a game player, and at that time, a keyword is incorporated into the end of the chat document, decision of S304 becomes YES and action processing of a character corresponding to the keyword is executed (S305). That is, action of the character corresponding to a table is read out to control a character of a player B according to the action read out. Then, a blow-off 519 is added in S303 and screen control information wherein action is controlled in S303 is transmitted to the video game machine (S306).