An immersive headset system includes a headset device and a displaying device. The headset device includes a pupillary sensor for determining an interpupillary distance value. The displaying device is communicated with the headset device. The displaying device includes a display panel for displaying an immersive content. The immersive content includes a right visual window and a left visual window. The right visual window and the left visual window are displayed synchronously at different positions on the display panel. When the displaying device receives the interpupillary distance value from the headset device, the right visual window and the left visual window of the immersive content are allocated by the displaying device according to the interpupillary distance value.