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.