A robot control apparatus has keys for input/output control and an execution key for permitting execution therefor. A key can be allocated for a reservation sequence stored beforehand. When an operation program is taught for a robot, the reservation sequence allocated to the key can be executed when the key is pressed while the execution is pressed. Then, an operation program can be programmed more correctly by controlling the robot, and time for programming a sequence program is shortened. Execution of an input/output operation due to unintentional or erroneous operation is prevented. Two input/output control sequences can be allocated to one key.