To accurately complement a pressure sense failure in a touch panel.

An information processing device comprises: contact detection means that detects a trajectory of contact of a pen-type input apparatus with a screen; display means that displays the trajectory on the screen; measurement means that acquires the angle and velocity of the pen-type input apparatus with respect to the screen; and line setting means that sets the width of the trajectory displayed by the display means to be thicker as an end point is closer when a difference in the angle between the start and end of detection of the trajectory is smaller than a predetermined threshold or when the velocity at the end is lower than the velocity at the start.