A programmable display device connectable to a programmable logic controller in a communicable manner includes a sightline estimate unit, which estimates a direction of a sightline using image data obtained by capturing an image of a person, a display control unit, which displays a screen including an object on a display, a measurement unit, which measures a time period for which the sightline is directed to the object when the sightline is determined to be directed to the object through the estimation, and a storage unit, which stores image identification information identifying the object and time information indicating the measured time period in association with each other. This allows a third person to determine a time period for which a user has gazed at an object.
Programmable display device, portable terminal device, data processing method, and program