A centralized monitoring system comprising: a centralized monitoring apparatus for performing centralized monitoring through a communication line for at least two preservation devices to be monitored, and at least two preservation devices each including a storage for storing a preservation object, a temperature sensor configured to detect a temperature within the storage, and a temperature variable device configured to cool or heat an inside of the storage with reference to the detected temperature of the temperature sensor such that the temperature within the storage reaches an individual set temperature for preserving the preservation object, the centralized monitoring apparatus comprising: an input device configured to be input with channel data for each preservation device comprising first information indicative of a second time zone and second information indicative of a set temperature of the second time zone, the temperature variable device of the respective preservation device performing power saving operation in the second time zone as compared to operation in a first time zone; a storage device configured to store the channel data comprising the first information and the second information from the input device; a timing device configured to measure a current time; and a control device configured to control the temperature variable devices of each preservation device through the communication line, based on the first information and the second information stored in the storage device for the respective preservation device and on the current time measured by the timing device, such that the temperature variable device of the respective preservation devices starts operation of turning the temperature within the storage to the set temperature of the second time zone when the current time reaches a starting time of the second time zone, and that the temperature variable device of the respective preservation devices terminates the operation of turning the temperature within the storage to the set temperature of the second time zone when the current time reaches an ending time of the second time zone. a centralized monitoring apparatus for performing centralized monitoring through a communication line for at least two preservation devices to be monitored, and at least two preservation devices each including a storage for storing a preservation object, a temperature sensor configured to detect a temperature within the storage, and a temperature variable device configured to cool or heat an inside of the storage with reference to the detected temperature of the temperature sensor such that the temperature within the storage reaches an individual set temperature for preserving the preservation object, the centralized monitoring apparatus comprising: an input device configured to be input with channel data for each preservation device comprising first information indicative of a second time zone and second information indicative of a set temperature of the second time zone, the temperature variable device of the respective preservation device performing power saving operation in the second time zone as compared to operation in a first time zone; a storage device configured to store the channel data comprising the first information and the second information from the input device; a timing device configured to measure a current time; and a control device configured to control the temperature variable devices of each preservation device through the communication line, based on the first information and the second information stored in the storage device for the respective preservation device and on the current time measured by the timing device, such that the temperature variable device of the respective preservation devices starts operation of turning the temperature within the storage to the set temperature of the second time zone when the current time reaches a starting time of the second time zone, and that the temperature variable device of the respective preservation devices terminates the operation of turning the temperature within the storage to the set temperature of the second time zone when the current time reaches an ending time of the second time zone. an input device configured to be input with channel data for each preservation device comprising first information indicative of a second time zone and second information indicative of a set temperature of the second time zone, the temperature variable device of the respective preservation device performing power saving operation in the second time zone as compared to operation in a first time zone; a storage device configured to store the channel data comprising the first information and the second information from the input device; a timing device configured to measure a current time; and a control device configured to control the temperature variable devices of each preservation device through the communication line, based on the first information and the second information stored in the storage device for the respective preservation device and on the current time measured by the timing device, such that the temperature variable device of the respective preservation devices starts operation of turning the temperature within the storage to the set temperature of the second time zone when the current time reaches a starting time of the second time zone, and that the temperature variable device of the respective preservation devices terminates the operation of turning the temperature within the storage to the set temperature of the second time zone when the current time reaches an ending time of the second time zone.