An image processing system includes a plurality of clients, a plurality of
servers, and a computer. The computer includes a user application and a
multi-target controller. The user application interactively operates with
a user. The multi-target controller causes the plurality of clients to
synchronously access the plurality of servers in response to a request
from the user application, acquire from the plurality of servers a
plurality of pieces of target data corresponding to a plurality of
sub-regions in a draw region of the user application, and expand the
plurality of pieces of target data into a plurality of pieces of draw
data. The multi-target controller further combines the plurality of
pieces of draw data returned from the plurality of clients into single
draw data and passes the single draw data to the user application.