| 摘要 |
A problem of this invention is to satisfy both of securement of visibility of a display unit and suppression of noises at the time of a telephone call etc. using a receiver and a microphone. In a portable terminal apparatus which relates to the invention, a control unit ( 16 ) judges whether a handsfree device ( 20 ) is connected or not, on the occasion that a telephone call operation is carried out by an operation unit ( 18 ) and a voice telephone call operation by a telephone call circuit ( 11 ) and a transmission/receiving unit ( 12 ) is started, and in case that the handsfree device ( 20 ) is not connected, it is judged that a user is making a telephone call by use of a receiver ( 13 ) and a microphone ( 14 ) in an apparatus main body in such a state that he puts an apparatus casing to his ear part, and at least one of a drive system, drive frequency of a display unit ( 19 ) which comprises a liquid crystal display is changed, and a drive operation giving priority over acoustic characteristics is carried out. On one hand, in case that the handsfree device ( 20 ) is connected, a drive operation with high picture quality giving priority over optical characteristics of the display unit ( 19 ) is carried out without changing the drive system etc.
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