Intercom device and control system

An intercom device comprising:

• an entrance slave unit configured to call and talk from a visitor to a resident;
• and
• a living room master device configured to respond to a call from the entrance slave unit,
• wherein the entrance slave unit includes a touch operable aerial display configured to display an aerial image toward the visitor, a control unit configured to control the touch operable aerial display, and a sensor arranged in a predetermined space and capable of detecting an attribute of the visitor,
• wherein the touch operable aerial display includes a light source for emitting light to generate the aerial image, an optical member for reflecting and transmitting the light so as to form the aerial image in the predetermined space, and a detection unit for detecting an operation input of the visitor with respect to the aerial image,
• wherein the control unit changes a display mode of a call operation acceptance unit based on the attribute detected by the sensor,
• wherein the attribute is at least one of a height and an age of the visitor,
• wherein the control unit displays the call operation acceptance unit in a first display mode when the height or the age is equal to or higher than a predetermined threshold value, and
• wherein the control unit displays the call operation acceptance unit in a second display mode which is a simpler display mode than the first display mode when the height or the age is lower than the predetermined threshold value.