To read a storage region optionally set onto both the sides of an original with a small processing load.

The arrangement relationship between downstream and upstream sides of first and second read sections 11A, 11B, and a spacing K between both the read sections are decided from: the spacing between upstream and downstream ends D1, C2 of first and second regions 30A, 30B, respectively, optionally designated on both the sides of the original 24; and relationship on which of the respective regions is disposed at a downstream side (upstream side) to a conveyance direction. The first and second regions 30A, 30B of the conveyed original 24 successively oppose the first and second read sections 11A, 11B, respectively, set in this manner to read both the regions 30A, 30B successively.