A process is disclosed of operating a user interface device configured to display an image on a display screen and enable user input by a user's finger touch on a touch screen in association with the displayed image, the process including: after the user starts a finger touch on the touch screen, if the user holds the finger at a substantially same location for a duration equal to or longer than a predetermined duration, initiating stationary displaying to display the image stationarily on the display screen, despite any later finger-slide motions on screen; and, after the stationary displaying starts, if a match is made between the finger's contact point on the touch screen and a location of a desirable graphical object included in the image displayed on the display screen, determining that the user has provisionally selected the object.