1. A video conference system in which at least a pair of terminal devices transmits and receives an image through a network, one of the pair of terminal devices comprising: a face detection unit that detects a face from a first image captured by a camera; a position detection unit that detects a first position of a display unit capable of displaying an image; and a generation unit that generates a second image in which a third image of the face detected by the face detection unit is arranged around an image region of a fourth image which is of a material used for a conference, the generation of the second image being performed in accordance to a relative position of the face detected by the face detection unit, and the first position detected by the position detection unit, wherein the camera captures the first image which includes a participant using the one of the pair of terminal devices and attending the conference and the display unit capable of displaying an image acquired from another of the pair of terminal devices, the one of the pair of terminal devices further comprises: a rotation processing unit that rotates the first image so that the display unit detected by the position detection unit is positioned at an upper part in a vertical direction and at a center in a horizontal direction, wherein the generation unit arranges the third image in accordance with the relative position of the face in the first image rotated by the rotation processing unit.