1. An image-processing camera system, comprising: an image pickup device that acquires image data; a plurality of application programs each set by use of the image data so as to have a different function; an image pickup device controller that controls the image pickup device in accordance with image data acquisition requests associated with the plural application programs; and a controller that activates the plural application programs to acquire the image data from the image pickup device and concurrently executes the plural application programs; wherein the image-processing camera system further includes: means for storing the image data volumes and image data acquisition rates necessary in the plural application programs; means for selecting concurrently executable application programs on the basis of the image data volumes and image data acquisition rates; and an image acquisition scheduler for determining image data acquisition timing and intervals at which a plurality of concurrently executable application programs each repeats acquiring the image data from the image pickup device without overlapping in terms of time.