Abstract: Disclosed is a technology that allows a plurality of mobile phones to execute a game. Utilization information is stored for each mobile phone which indicates other mobile phones that have played or tried to play the game with the mobile phone. A request is received from a challenger mobile phone for selecting an opponent of a match-up in the game. Opponent candidates are selected from among the other mobile phones based on the utilization information. A list of the opponent candidates is transmitted to the challenger mobile phone. The challenger mobile phone selects an opponent mobile phone from the list. A match-up challenge is sent to the opponent mobile phone. When acceptance information is received from the opponent mobile phone, match-up start mail is transmitted to the challenger mobile phone and the opponent mobile phone.

Abstract: Disclosed is a technology that allows a user of a mobile phone having a game execution function to easily find another mobile phone user who can immediately play a match-up with him/her in the game. A page of an opponent selection site that is provided by a server apparatus is individually created for each mobile phone user who logs on while assigning the kind of a game for a match-up. On the opponent selection site, match-up opponent candidates who are liable to play a match-up in the game of the kind assigned by the mobile phone user who logs on are listed.