To provide a natural gas area utilizing system facilitating utilizing of natural gas for a demander in an area with a local city serving as the center. SOLUTION: This system comprises a first storage device 1 set up in an area for storing liquefied natural gas, means 3, 4 for changing liquefied natural gas into compressed natural gas, means for utilizing cold heat generated at change time, and a second storage device 5 for storing changed compressed natural gas. By the LNG low temperature storage device 1, all fuel gas required in the area can be supplied, and cold heat generated in the case of changing LNG into CNG is effectively utilized, to be able to also serve as promotion of district industry.