The present invention is capable of separatingremoving the influence of skin blood flow contained in near infrared spectroscopy signals and extracting a brain- or brain cortex-origin signal. Suppose that a direction of an exit road with respect to an approach road at an intersection belongs to a peripheral portion of one of directional areas that are provided to determine at an intersection the approximate direction of the exit road with respect to the approach road. A timing controller includes a receiving unit, a compression unit, a decompression unit and a processing unit.