With the conventional techniques, when the images taken under various conditions such as plural aspect ratios, horizontal shooting and vertical shooting are collectively selected and searched, the search conditions adaptable to all the images can not be specified, whereby there was a problem that the search could not be made as intended. In order to solve this problem, the present invention provides an image search apparatus comprising search object image designation means for designating a search object image, search condition input means for inputting the search conditions, feature amount extraction means for extracting a feature amount thereof from the search object image, feature amount transformation means for transforming the feature amount to adapt to the inputted search conditions, and determination means for determining whether or not the search object image is matched with the search conditions using the feature amount after transformation.