A single crystal pulling apparatus having a heater 4 melting material silicon by thermal radiation from a cylindrical exothermic part 4a which surrounds a crucible 3 inside a furnace body 2 and an electromagnet 13 which is prepared to surround the furnace body 2 and applies a transverse magnetic field to the silicon liquid melt in the crucible 3 is provided. According to an embodiment of the present invention, hardware thread-assist mode can be activated when one thread of the microprocessor is in a sleep mode. A first propulsive force requested by the driver and transmitted via a clutch involves determining whether the clutch slips while transmitting the first propulsive force. All image data recorded in the camera is displayed in a demagnified form in the vicinity of the camera, and when image data specified by a predetermined operation is transferred into a recording area, a demagnified image of the transferred image data is displayed in the vicinity of the recording area.