To reduce a cost for the whole system, to prevent time information for indicating a time from being erased, and to facilitate control, in a control system wherein a detector having a detecting means for detecting various data is connected to a controller for controlling the data detected by the detector to control the data detected by the detector while corresponding to the time.

In the controller 20, the time is detected at a prescribed time interval by a clocking means 25 (S101), and the detected time information indicating the detected time is transmitted to the detector 10 (S103). In the detector 10, the detected time information is received (S105), a lapse time is detected by a timer means 14 (S108), the time is calculated based on the detected lapse time and the detected time information (S109), and a detected data is recorded to correspond to calculated time information indicating a calculated time.