In a case where a first information including an execution request of a specific function via a first type of interface (22) is received, a function executing device (10) may execute a change process for changing an interface for communicating with a terminal device (50) from the first type of interface (22) to a second type of interface (20) in a case where a state of the function executing device (10) is determined as a non-error state. The function executing device (10) may not execute the change process in a case where the state of the function executing device (10) is determined as an error state. The specific function may include a communication process for communicating object data with the terminal device (50). The function executing device (10) may execute the specific function including the communication process via the second type of interface (20) in a case where the change process is being executed.