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, 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, and in which the function setting means is further provided with a means for carrying out scene analysis and obtaining a confidence of the scene analysis; a means for setting the image obtaining function according to a photographing mode, and a means for setting the used image obtaining function according to the scene of the pre-taken-image or the running image, and the function setting means sets the used image obtaining function so that the priority is put on the means for setting the used image obtaining function according to the scene of the pre-taken-image or the running image rather than the means for setting the image obtaining function according to a photographing mode when the confidence in the scene analysis is high.