Abstract: A building entrance device (10B) of an intercom device includes a touch operable aerial display (100) for displaying an aerial image (G1, G2) toward a visitor (W1, W2), and a control unit (110). The touch operable aerial display (100) includes: a display device (101) for emitting light; an optical member (102) for reflecting and transmitting light so as to form the aerial image (G1, G2) in a predetermined space; and a detection unit (103) for detecting an operation input of the visitor (W1, W2) to the aerial image (G1, G2). The control unit (110) changes at least one from among a display position, a display angle of the aerial images (G1, G2), and a display mode of a call operation acceptance unit included in the aerial images (G1, G2).

Abstract: An execution program holder holds an execution program that includes execution instructions and configuration instructions that are executed together by a processor. A reconfigurable processing device comprises a programmable device that can reconfigure a circuit, and executes process contents that are instructed through executing the execution instructions by the processor. A circuit information holding and configuration controller holds circuit information that is designated when the processor executes the configuration instructions, and incorporates the reconfigurable processing device with that circuit information to configure a circuit.