1. An image capturing apparatus comprising: image input means for inputting an image to be captured; face detecting means for detecting a face of at least one photographic subject included in the input image; face-attribute detecting means for detecting attribute information of the detected face; degree-of-friendliness computing means for evaluating a degree of friendliness between a plurality of photographic subjects based on a correlation between items of attribute information of detected faces of the plurality of photographic subjects, the items of attribute information being detected by the face-attribute detecting means, and outputting a first evaluation value representing the degree of friendliness; and image-capturing determining means for determining a timing to capture the input image based on the first evaluation value, wherein the degree-of-friendliness computing means evaluates the degree of friendliness by taking into consideration degrees of smiling of the detected faces, the degrees of smiling being detected by the face-attribute detecting means.