Abstract: A display device including a display unit having a display panel and a camera; a posture adjustment driving unit configured to adjust a posture of the display unit; and a controller configured to control the camera to capture a first image of a viewer viewing the display unit, calculate a first viewer posture inferred by an artificial intelligence model from the first image captured by the camera, control the posture adjustment driving unit to adjust the posture of the display unit to correspond to a feature point of the viewer based on the calculated first viewer posture, and control the posture adjustment driving unit to adjust the posture of the display unit to have a height fluctuation of a sinusoidal curve trajectory continuous within a vertical top-bottom movement range of the display unit based on the calculated first viewer posture.

Abstract: An optional tour agency organizing optional tours that are combined with an airline ticket-hotel reservation package at a customer's discretion is provided with booking state information. Optional tour agencies located in various places and organizing optional tours refer to a booking information aggregating device for travel booking information. Each optional tour agency accesses the booking information aggregating device (101) from a terminal device (102) to refer to booking information under specified extraction conditions. The booking information aggregating device (101) sends a result of aggregation performed under the extraction conditions to the terminal device.