A counterpart terminal information management system comprising: a terminal manager that manages, in association with each other, terminal identification information for identifying a terminal and terminal-related information previously set by default, for each one of a plurality of terminals; a counterpart terminal manager that manages, in association with one another, the terminal identification information for identifying the terminal, counterpart terminal identification information for identifying a candidate counterpart terminal that may be requested by the terminal to have communication with, and counterpart terminal-related information individually set by a user who operates the terminal, for each one of the plurality of terminals; a receiver that receives, from a first terminal, a request to share a candidate counterpart terminal identification information managed for the first terminal with a second terminal and information indicating whether to permit or reject sharing of the counterpart terminal-related information individually set by the user of the first terminal with the second terminal; and a transmitter that transmits information regarding the candidate counterpart terminal to the second terminal, said information being managed for the first terminal, wherein in response to the information indicating to permit sharing of the counterpart terminal-related information, the transmitter transmits the counterpart terminal-related information of the candidate counterpart terminal to be shared, which is managed by the counterpart terminal manager in association with the terminal identification information of the first terminal, and in response to the information indicating to reject sharing of the counterpart terminal-related information, the transmitter transmits the terminal-related information of the candidate counterpart terminal to be shared, which is managed by the terminal manager in association with the terminal identification information of the candidate counterpart terminal. a terminal manager that manages, in association with each other, terminal identification information for identifying a terminal and terminal-related information previously set by default, for each one of a plurality of terminals; a counterpart terminal manager that manages, in association with one another, the terminal identification information for identifying the terminal, counterpart terminal identification information for identifying a candidate counterpart terminal that may be requested by the terminal to have communication with, and counterpart terminal-related information individually set by a user who operates the terminal, for each one of the plurality of terminals; a receiver that receives, from a first terminal, a request to share a candidate counterpart terminal identification information managed for the first terminal with a second terminal and information indicating whether to permit or reject sharing of the counterpart terminal-related information individually set by the user of the first terminal with the second terminal; and a transmitter that transmits information regarding the candidate counterpart terminal to the second terminal, said information being managed for the first terminal, wherein in response to the information indicating to permit sharing of the counterpart terminal-related information, the transmitter transmits the counterpart terminal-related information of the candidate counterpart terminal to be shared, which is managed by the counterpart terminal manager in association with the terminal identification information of the first terminal, and in response to the information indicating to reject sharing of the counterpart terminal-related information, the transmitter transmits the terminal-related information of the candidate counterpart terminal to be shared, which is managed by the terminal manager in association with the terminal identification information of the candidate counterpart terminal.