1. An imaging controller comprising: an index calculator to calculate an index value for each of divided areas of images captured by a plurality of imaging units, the index value for evaluating a photographic state of each of the divided areas; an evaluation value calculator to evaluate the images and an overlapping area between the images on the basis of the index value of each divided area calculated by the index calculator and calculate an overall evaluation value; and a condition determiner to determine an imaging condition for each of the imaging units on the basis of the overall evaluation value calculated by the evaluation value calculator.