Patent ID: 7508413

Claim:
A data transmission device for executing a data transmission to and from each of a first user terminal, a second user terminal, and a third user terminal, comprising: a receiving unit for receiving voice data and moving image data transmitted from each of the first user terminal and the second user terminal; an identifying unit for identifying a user terminal of a current speaker from among the first user terminal and the second user terminal, based on the voice data which have been transmitted from the first user terminal and the second user terminal and received by the receiving unit; a selecting unit for selecting from among the moving image data sent from the first user terminal and the second user terminal the moving image data corresponding to the user terminal identified by the identifying unit; a storage unit for storing information related to the user terminal of the current speaker identified by the identifying unit; and a transmitting unit for transmitting selected image information having the moving image data selected by the selecting unit to the third user terminal, and not the image information having the moving image data which is not selected by the selecting unit.