A method of restoring paintings includes steps for acquiring image data of a painting having a deteriorated part evidencing deterioration including at least one selected from among fading, exfoliation, and damage or loss of the support; generating digital restoration data in which the damaged part of the image data is restored by digital simulation using a computer; printing the digital restoration data on a backing of the painting using ink; and lamination of the printed backing material of the painting to the back of the painting.