Leadership support system determining a danger of isolation of a group member even under temporarily worsened communication conditions

A leadership support method in a wireless network of nodes, each of which comprises a leadership support terminal for relaying communication information for use in supervision of leadership, wherein at least one of the leadership support terminals is carried as a leader terminal by a leader of a group, and remaining ones of the leadership support terminals are carried as member terminals by members of the group, of which movement is supervised, said method comprising:

• a first step of recording a plurality of pieces of terminal identification information of the member terminals in the leader terminal, and transmitting an information request contained in the communication information addressed to ones of the member terminals corresponding to the plurality of pieces of terminal identification information recorded in the leader terminal;
• a second step of, in the member terminals, relaying the communication information not addressed to the member terminal or receiving the communication information addressed to the leader terminal, and sending back communication information containing an information response to the received communication information;
• and
• a third step of determining, in the leader terminal, based on a number of times of relaying the communication information, whether or not the member terminal that transmitted the communication information is in danger of isolation, and outputting, when the member terminal is determined to be in danger of isolation, a warning to the determined member terminal.