A portable wireless terminal device which has a main body including a first case provided with a plurality of manual keys, a second case provided with a display having a rectangular screen of a predetermined aspect ratio, and a connecting mechanism for interconnecting the two cases. The connecting mechanism includes a pivot mechanism for rotating the second case relative to the first case along a plane parallel to the screen. For wireless communication, the display is activated in a screen position wherein the screen is elongated vertically. For receiving a television broadcast, the display is activated in a screen position wherein the screen is elongated horizontally.