An image processing system is provided in which an image supplying apparatus is connected to a plurality of image processing apparatuses via a network, where at least one image processing apparatus executes processing requested by a user for image data supplied from the image supplying apparatus. The image supplying apparatus includes a determination unit configured to determine whether the image data requests a security condition, a decision unit configured to decide on the security condition, a search unit configured to search the plurality of image processing apparatuses for an image processing apparatus which is capable of executing the processing requested by the user and satisfies the security condition, a display unit configured to display the image processing apparatus detected by the search unit so as to allow the user to select the image processing apparatus, and a transmission unit configured to transmit the image data to the image processing apparatus.