1. A group contact system comprising: a plurality of first information terminals each being configured for a respective user to communicate via a communication service over a network; and a second information terminal connected to the network, said second information terminal being configured for management of the communication service; wherein: each of said first information terminals includes: means for selecting members of a group by a selecting user for designating at least one other user as a designated user so as to form the group of designated users with the selecting user, said selecting means also configured to designate corresponding group information identifying designated users in the group, each of the designated user and the selecting user accessing the communication service from respective ones of said first communication terminals; said second information terminal includes: user information storing means for storing user information, said user information including information identifying each user and a corresponding one of said first information terminals on said network utilized by the user to access the communication service; and means for compiling group information including user information relating to each designated user designated by said group forming means in response to said selecting means in said first information terminal.