PURPOSE: To correct the parallax without precise operation by specifying the position of a sound source by phase deviations of sound waveforms inputted from plural microphones arranged in the vicinity of a touch sensor panel and detecting the direction of an operator.

CONSTITUTION: A touch sensor panel 12 is put like a layer on the upper face of a display panel 11 consisting of liquid crystal, and microphones 19a to 19c are arranged in the vicinity of the touch sensor panel 12. Sounds inputted from microphones 19a to 19c are sent to a sound source position specifying circuit 20 as parallax correction information, and the direction of the sound source is detected by phase deviations of sound waveforms, and angles in horizontal and vertical directions of the line of sight of the operator are detected, and a correction extent setting circuit 21 detects the extent of correction of the parallax. Meanwhile, the touch sensor panel 12 and a coordinate detection circuit 14 detect the coordinate information including the line of sight, and a coordinate correction circuit 15 corrects this coordinate information by the extent of correction of the parallax from a correction extent setting circuit 21 and sends corrected data to an information processor 16. Corrected data is displayed on a display panel 11.