A mobile terminal apparatus comprises: a touch pad sensor that is arranged on a back surface of a housing, and detects a contact position when held by a user; and a holding pattern determining unit that determines a holding pattern having a highest similarity to a touch pad detection data detected by the touch pad sensor among a plurality of predetermined holding patterns to output the determined holding pattern. The mobile terminal apparatus controls an orientation of information displayed on a display screen of a display unit based on the holding pattern outputted by the holding pattern determining unit.