An image display unit is provided which includes an input module receiving touch inputs, a display module displaying an image thereon, a touched state detection module detecting a touch input made onto the input module, a touched position acquiring module acquiring a touched position of the touch input, a flick detection module detecting whether the touch input is made by a flick operation, a flick direction detection module detecting a direction of the flick operation, and a display screen changing module executing either of a first display screen changing process of increasing the number of images displayed on the display module and contracting images displayed on the display module and a second display screen changing process of decreasing the number of images displayed on the display module and expanding images displayed on the display module based on the direction of the flick operation.