Ntt Docomo, Inc.

Takeshi Iitaka

Tomohiro Ando

Rei Takahashi

Kazuka Higashi

An object is to provide a telephone enabling a user of a telephone to readily recognize which telephone user is a source of voice under transmission. This telephonehas a receiverfor receiving telephone information to specify each of an authorized telephone and unauthorized telephones, a display surfacefor displaying predetermined information based on the received telephone information, and a display control partfor specifying a content of the predetermined information, based on the telephone information received by the receiver, and for displaying the content on the display surface. The display control partfixedly displays user information to specify a user of the authorized telephone, in a partial region of the display surface, and displays at least part of user information to specify users of telephones except for the concerned telephoneamong the authorized telephone and unauthorized telephones, in a remaining region except for the partial region of the display surface

Telephone used in a telephone system for transmitting data from an authorized telephone with speech authority to an unauthorized telephone without speech authority

An object of the present invention is to be able to rejoin a group call by spontaneous operation from the terminal side at an optional timing. The group call server provides a plurality of mobile communications terminals with a function of a group call between the terminals through a communications network, and comprises: an ID granting unit that grants the group call to be established a call ID that identifies the group call; an ID notification unit that gives the terminals participating in the group call to be established the call ID granted to the group call by the ID granting unit; a rejoin request receiving unit that receives requests to rejoin the group call that have been transmitted from a terminal disconnected from the group call and that include the call ID; and a rejoin control unit that allows the terminal that transmitted the request to rejoin the group call related to the call ID included in the rejoin request received by the rejoin request receiving unit.

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Yokosuka, Japan

Takeshi Iitaka