| 摘要 |
An apparatus, system, method, and computer-readable medium provides control for displaying, on a display device, a classroom screen with symbolic images representative of a plurality of slave instruments connected to a master instrument in accordance with actual positional relationship between the slave instruments in the classroom, or by different locations thereof. Any one of the symbolic images displayed on the display device can be selected and moved to a desired position from the original position. A moved position of the moved symbolic image is determined. If the determined moved position is a position corresponding to another of symbolic images, the group identification, which can be stored in a storage, of the slave instrument corresponding to the moved symbolic image is changed to the group identification corresponding to the slave instrument associated with the symbolic image located at the moved position. The display is automatically changed so that the moved symbolic image returns from the moved position to the original position.
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