Patent ID: 8325895

Claim:
A conference system used to hold a conference on a communication network, comprising: client terminals of participants of the conference, connected to the communication network; telephone sets of the participants, connected to a telephone line; a telephone line device connected to the telephone sets through the telephone line; and a server connected to the communication network and capable of operating the telephone line device, wherein; the server has a function of authenticating the client terminals of the participants of the conference; and the telephone line device has a function of setting a telephone line for the conference among the telephone sets of the participants, wherein; the server sends a conference notification email to the client terminals when a conference reservation is made, the conference notification email includes a call destination telephone number of the participant, and the call destination telephone number is changeable, wherein the server has a memory table, the memory table includes at least telephone numbers of the participants, the call destination telephone number is obtained from the telephone numbers of the memory table and is included in the conference notification email, the call destination telephone number included in the conference notification email is displayed as a link which is selectable, when the link is selected, a change screen for changing the memory table of the server is displayed, and when a desired call destination telephone number is inputted to the displayed change screen, the telephone number of the memory table is changed.