To enable identification of a user who has transmitted image data generated by scanning by an image processing apparatus, the image processing apparatus that communicates with a chat server that performs control, based on received information indicating a talk room of the chat server, to display information indicating received image data and transmission source user information indicating a user who has transmitted the image data on the talk room includes a reading unit configured to read an image of an original document and generate image data based on the image, a designation unit configured to designate a talk room of the chat server; and a transmission unit configured to transmit the image data generated by the reading unit, information indicating the talk room designated by the designation unit and the transmission source user information to the chat server.