Patent ID: 9503439
Filing Date: 2016-11-22
CPC Classification: G06F,H04L

Claim Text:
1. A communication system comprising a transmission terminal, that is configured to perform communication with at least one counterpart transmission terminal, and a management device connected to the transmission terminal over a network, the management device comprising: a memory configured to store authentication management information in which identification information for identifying the transmission terminal or a first user who uses the transmission terminal, and authentication information of the transmission terminal or the first user are associated with each other, and contact list management information in which the identification information for identifying the transmission terminal or the first user, and the identification information of one or a plurality of contact terminal candidates serving as a potential counterpart transmission terminal of the transmission terminal or the first user for the communication are associated with each other; and circuitry configured to the transmission terminal comprising: circuitry configured to wherein the circuitry of transmission terminal controls transmission of the identification information and the authentication information of the second user to the management device, the circuitry of the management device controls reception of the identification information and the authentication information of the second user from the transmission terminal, in a case of receiving the identification information and the authentication information of the second user, the circuitry of the management device performs authentication of the second user based on the authentication management information, in a case where the second user is authenticated, the circuitry of the management device acquires the identification information of the contact terminal candidate corresponding to the identification information of the second user from the contact list management information, the circuitry of the management device controls transmission of, to the transmission terminal, contact list information about the second user, the contact list information including the extracted identification information of the contact terminal candidate corresponding to the identification information of the second user, the circuitry of the transmission terminal controls reception of the contact list information about the second user from the management device, the circuitry of the transmission terminal creates a contact list about the second user based on the contact list information about the second user, and the circuitry of the transmission terminal controls display of the contact list of the second user on the display, wherein when the second user enters a log-in state to the management device via the transmission terminal while the fist user is in the log-in state to the management device via the transmission terminal, the transmission terminal updates the displayed contact list about the transmission terminal or the first user on the display to display the contact list of the second user.