To enable a user to create and execute an optional program in order to realize various functions.

The image photographing apparatus having a photographing means for photographing an object stores a group of processing instructions including an image state compatible processing instruction in cross-reference with a state of an image to a user program storage area 302a prior to the photographing. The image photographing processing apparatus detects a state of an image corresponding to the object photographed by the imaging means, reads the processing instruction corresponding to the state of the detected image from an instruction word storage area 202a, and controls the photographing means according to the group of processing instructions stored in the user program storage area 302a.