An information processing device is provided with: a display control unit (12) which, using screen information relating to a portable terminal (2) and received by a video communication unit (11), displays the screen of the portable terminal (2) on a touch panel display (13); an operation region acquisition unit (14) which subjects the screen of the touch panel display (13) on which the screen of the portable terminal (2) is displayed to image analysis, and acquires operation region information that specifies a touch operation region corresponding to the screen of the portable terminal (2); a touch operation information acquisition unit (16) which detects a touch operation on the touch panel display (13), and acquires position information relating to the touch operation detected on the basis of the operation region information; and a coordinate transformation unit (17) which, on the basis of the operation region information, transforms the position information relating to the touch operation and acquired by the touch operation information acquisition unit (16) into position information corresponding to the screen of the portable terminal (2), and the device remotely operates the portable terminal (2) by an operation/control information communication unit (18) transmitting, as remote operation information, the transformed position information to the portable terminal (2).