A method of managing candidate lists, comprising: a storing step of storing candidate lists in a storage area (60, 202, 203, 205, 206, 213), which associate, for each one of a plurality of starting terminals, starting terminal identification information for identifying the starting terminal capable of requesting to start communication comprising at least sound data with one or more candidate counterpart terminals in its candidate list, and candidate counterpart terminal identification information for identifying each one of the one or more candidate counterpart terminals, the storage area (60, 202, 203, 205, 206, 213) storing candidate lists for starting terminals managed by a first administrator and candidate lists for starting terminals managed by a second administrator, the starting terminals managed by the first administrator being different from the starting terminals managed by the second administrator; a displaying step of displaying, by an administrator terminal operated by a first administrator, a management terminal list screen indicating a list of transmission terminals managed by the first administrator; a receiving step of receiving, from the administrator terminal operated by the first administrator, a request for deleting at least one candidate counterpart terminal selected from the one or more candidate counterpart terminals managed by the second administrator from the candidate lists of all starting terminals managed by the first administrator; a determining step of determining the starting terminals (10aa, 10ab) managed by the first administrator which have the selected candidate counterpart terminal in their candidate list; a first deleting step of deleting the candidate counterpart terminal identification information of the selected candidate counterpart terminal, from one or more candidate counterpart terminals in the candidate lists of the determined starting terminals (10aa, 10ab); a transmitting step of transmitting a notification of deletion completion indicating counterpart deletion to the determined starting terminals (10aa, 10ab) and the selected candidate counterpart terminal; and a second deleting step of deleting the candidate counterpart terminal identification information of the determined starting terminals (10aa, 10ab) from the candidate list of the selected candidate counterpart terminal. a storing step of storing candidate lists in a storage area (60, 202, 203, 205, 206, 213), which associate, for each one of a plurality of starting terminals, starting terminal identification information for identifying the starting terminal capable of requesting to start communication comprising at least sound data with one or more candidate counterpart terminals in its candidate list, and candidate counterpart terminal identification information for identifying each one of the one or more candidate counterpart terminals, the storage area (60, 202, 203, 205, 206, 213) storing candidate lists for starting terminals managed by a first administrator and candidate lists for starting terminals managed by a second administrator, the starting terminals managed by the first administrator being different from the starting terminals managed by the second administrator; a displaying step of displaying, by an administrator terminal operated by a first administrator, a management terminal list screen indicating a list of transmission terminals managed by the first administrator; a receiving step of receiving, from the administrator terminal operated by the first administrator, a request for deleting at least one candidate counterpart terminal selected from the one or more candidate counterpart terminals managed by the second administrator from the candidate lists of all starting terminals managed by the first administrator; a determining step of determining the starting terminals (10aa, 10ab) managed by the first administrator which have the selected candidate counterpart terminal in their candidate list; a first deleting step of deleting the candidate counterpart terminal identification information of the selected candidate counterpart terminal, from one or more candidate counterpart terminals in the candidate lists of the determined starting terminals (10aa, 10ab); a transmitting step of transmitting a notification of deletion completion indicating counterpart deletion to the determined starting terminals (10aa, 10ab) and the selected candidate counterpart terminal; and a second deleting step of deleting the candidate counterpart terminal identification information of the determined starting terminals (10aa, 10ab) from the candidate list of the selected candidate counterpart terminal.