1. An image taking system comprising an image taking means which takes an image, an objective body detecting means which detects at least a predetermined objective body from a pre-taken-image or a running image taken by the image taking means, a function setting means which, when the predetermined objective body is detected, sets an image obtaining function used in taking the pre-taken-image or the running image, according to the predetermined objective body out of image obtaining functions comprising at least one function for setting at least one of image taking conditions in taking the pre-taken-image or the running image, and/or at least one of image taking functions for setting at least one image processing condition to be carried out on the image obtained by taking the pre-taken-image or the running image, and a processing control means which obtains the image by the use of the image taking condition and/or the image processing condition based on the set image obtaining function.