A communication management system, comprising: a candidate information manager (57, 5003) that stores first candidate information of a first communication terminal of a plurality of communication terminals, the first candidate information associating a group of one or more member communication terminals, with the first communication terminal; a transmitter that sends a request for selecting whether to modify the first candidate information of the first communication terminal, to a second communication terminal of the plurality of communication terminals, in response to receiving a request for sending the first candidate information to the second communication terminal from the first communication terminal; and a receiver that receives information indicating whether to modify the first candidate information of the first communication terminal, from the second communication terminal, wherein the candidate information manager (60, 5101) modifies the group of one or more member communication terminals indicated by the first candidate information of the first communication terminal in response to the information indicating to modify the first candidate information of the first communication terminal to generate second candidate information of the second communication terminal, the second candidate information associating a modified group of one or more member communication terminals, with the second communication terminal, further comprising that: when information indicating not to modify the first candidate information of the first communication terminal is received, the candidate information manager associates the first candidate information of the first communication terminal with the second communication terminal without generating the second candidate information of the second communication terminal. a candidate information manager (57, 5003) that stores first candidate information of a first communication terminal of a plurality of communication terminals, the first candidate information associating a group of one or more member communication terminals, with the first communication terminal; a transmitter that sends a request for selecting whether to modify the first candidate information of the first communication terminal, to a second communication terminal of the plurality of communication terminals, in response to receiving a request for sending the first candidate information to the second communication terminal from the first communication terminal; and a receiver that receives information indicating whether to modify the first candidate information of the first communication terminal, from the second communication terminal, wherein the candidate information manager (60, 5101) modifies the group of one or more member communication terminals indicated by the first candidate information of the first communication terminal in response to the information indicating to modify the first candidate information of the first communication terminal to generate second candidate information of the second communication terminal, the second candidate information associating a modified group of one or more member communication terminals, with the second communication terminal, further comprising that: when information indicating not to modify the first candidate information of the first communication terminal is received, the candidate information manager associates the first candidate information of the first communication terminal with the second communication terminal without generating the second candidate information of the second communication terminal. when information indicating not to modify the first candidate information of the first communication terminal is received, the candidate information manager associates the first candidate information of the first communication terminal with the second communication terminal without generating the second candidate information of the second communication terminal.