an image processing apparatus has first through n - th pluralities of programs which , when executed by a computer processor , perform respectively first through n - th functions of the image processing apparatus , where n denotes an integer more than 1 , and starts up , on a function - by - function basis , the first through n - th pluralities of programs respectively corresponding to the first through n - th functions . the image processing apparatus starts up , in a predetermined sequence , respective programs included in any one plurality of programs among the first through n - th pluralities of programs to a state in which the plurality of programs performs a corresponding function .