In event type push scan, information identifiable by communication between a scanner and a PC is limited by a communication protocol, and there is no method of notifying settings for scan from the scanner to the PC. For this reason, settings for push scan made by a user cannot be reflected on execution of scan. According to an embodiment, the scanner is controlled in the following way. That is, a condition to execute image reading is set, and the setting is stored. When image reading is instructed, an information processing apparatus is notified of an image reading event before the start of image reading. After that, control is performed to start image reading based on the stored condition in accordance with the instruction from the information processing apparatus according to the event notification.