A server device for net game is provided with a party organizing section 101 for organizing a plurality of members participating in a virtual party, a question preparing section 102 for preparing a specified number of questions to be presented to organized mobile communication terminals, a matching section 104 for selecting two members from those participating in the party based on answers to the prepared questions and a congeniality evaluation parameter value, a question drafting section 105 for letting the selected two members to draft a specified number of questions and possible answers corresponding to the questions, an access setting section 106 for enabling an access time and an imaginary access place to be set based on answers to the drafted questions and the congeniality evaluation parameter value, and an access judging section 107 for judging whether the two selected members have accessed at the set time and imaginary place and giving mailboxes.