PROBLEM TO BE SOLVED: To provide an optical simulation device and method and a program, enabling calculation costs to be suppressed and light emitted from a matter to be accurately simulated.SOLUTION: The optical simulation device comprises: an optical characteristic acquisition part 11 which acquires the optical characteristics of a matter a table conversion part 12 which converts the optical characteristics to a table set in which a probability distribution type table and an intensity distribution type table are combined a surface shape information acquisition part 13 which acquires information on the surface shape of the matter and a simulation part 14 which simulates the light emitted from the matter, on the basis of the information on the surface shape and the table set.SELECTED DRAWING: Figure 1COPYRIGHT: (C)2017,JPO&INPIT