The present invention is aimed at easily providing an image which is in focus at any position in the image to be an observation target of a user and is free from misalignment in the image in a virtual microscope or the like.An image outputting server 10 includes an image storing part 11 for storing a plurality of image data with different focal points taken in an imaging direction which are images of a predetermined imaging target, specified area inputting means 12 for inputting information specifying an area in the image data, focal point information obtaining means 13 for obtaining information indicating the matching degree of a focal point in a specified area of each of the plurality of image data, image selection means 14 for selecting an image data to be output from the plurality of image data on the basis of the matching degree of the focal point, and outputting means 15 for outputting the thus selected image data.