HEAD-UP DISPLAY SYSTEM

An HUB system is equipped with an HUB device for displaying a video in front of a vehicle; a communication unit for connecting a mobile device with the HUD device and establishing communication; a speaker for outputting sounds to a driver; a microphone for picking up the voices of the driver; a sound recognition unit for analyzing the picked-up voices; and an in-vehicle camera for photographing the face of the driver. When there is an incoming call at the mobile device, a calling indication of the mobile device is displayed on the display screen of the HUD device, an incoming call sound is outputted from the speaker, and on the basis of a result of an analysis of voices uttered by the driver performed by the sound recognition unit, the conversation operations of the mobile device are started or ended.