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Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2018

Summary of Estimated Useful Lives of Property, Plant and Equipment

Depreciation of all property, plant and equipment, except for land, is calculated using the straight-line method to allocate their cost, net of their residual values, over their estimated useful lives as follows:


		Estimated Useful Life
Buildings		5 – 40 years
Structures		5 – 40 years
Machinery and equipment (Telecommunications equipment and others)		2 – 40 years
Others
Vehicles		4 – 6 years
Tools		4 – 6 years
Office equipment		2 – 6 years

Summary of Amortization of Intangible Assets With Limited Useful Life

The Group amortizes intangible assets with a limited useful life using the straight-line method over the following periods:


		Estimated Useful Life
Development costs		5 – 6 years
Software		6 years
Industrial property rights		5 – 50 years
Frequency usage rights		5 – 10 years
Others¹		2 – 50 years

Membership rights (condominium membership and golf membership) and broadcast license included in others are classified as intangible assets with indefinite useful life.