Patent ID: 8896870

Claim:
An image forming system, comprising: an image forming apparatus; and an external terminal capable of performing communication with said image forming apparatus, wherein said image forming apparatus comprises a controller, coupled to a memory, configured to: transmit display data of an operation screen to be displayed on said external terminal to said external terminal; receive operation input information on an operation input into said operation screen from said external terminal; specify a first program to which an execution instruction is given through said operation screen, out of programs installed in said image forming apparatus, on the basis of said operation input information; determine a second program as an execution object program instead of said first program if said second program is installed in said external terminal, said second program having the same function as that of said first program and notify said external terminal that said second program is determined as said execution object program, said external terminal comprises a controller, coupled to a memory, configured to: display said operation screen on a display part of said external terminal on the basis of said display data transmitted from said image forming apparatus; transmit said operation input information on said operation input into said operation screen to said image forming apparatus; execute a processing in accordance with said second program when said external terminal is notified from said image forming apparatus that said second program is determined as said execution object program; and generate a display screen for displaying therein a result of said processing executed in accordance with said second program.