1. An image acquiring apparatus comprising: macro image acquiring means for acquiring a macro image of each of a plurality of samples; and control means including macro image acquisition control means for controlling an operation to acquire the macro image by the macro image acquiring means, and image pickup condition setting means for setting an image pickup condition for a micro image of the sample with reference to the macro image, wherein the control means includes session managing means for defining a session in accordance with a sample group consisting of the plurality of samples and managing a data group including data of the macro image and the image pickup condition for each of the samples as session data associated with the sample group for each session.