An image processing system where an image processing apparatus that includes an image data transmitting function and a mobile terminal that includes an electronic mail transmitting function operate to link with each other, the image processing apparatus including: a startup instruction transmitting unit; an image data acquiring unit; a transmission destination designation information acquiring unit; and an image data transmitting unit, and the mobile terminal including: an electronic mail function starting unit that starts up the electronic mail transmitting function and causes a predetermined display unit to display address information; a transmission destination designation information transmitting unit that receives an operation of designating a transmission destination address among the address information and transmit the transmission destination designation information to the image processing apparatus; and an attached file output unit that outputs the image data as an attached file of an electronic mail.