A control system for mechanical equipment (1/13), the mechanical equipment including a plurality of control target devices, the control system comprising a manual operation means (5/25) which is additionally provided in the mechanical equipment (1/13), a portable operation assistance terminal, a control device which is adapted to control the control target devices and a communication means which is adapted to connect the operation assistance terminal and the control device of the mechanical equipment (1/13), wherein the manual operation means (5/25) includes an operation switch (6, 7) adapted to control the individual control target devices included in the mechanical equipment (1/13), and a mechanical equipment identification signal transmission unit (11/26) adapted to transmit, to the operation assistance terminal, a mechanical equipment identification signal for identifying the mechanical equipment (1/13) including the manual operation means (5/25), the control device of the mechanical equipment (1/13) includes control units for individually controlling the control target devices, the operation assistance terminal comprises a screen adapted to display a manual operation assistance screen (44, 48) based on the mechanical equipment identification signal received from the mechanical equipment identification signal transmission unit (11/26), the manual operation assistance screen (44,48) including a manually operated device selection section (44a, 44b) adapted to select a manually operated device from the plurality of control target devices included in the mechanical equipment (1/13), and a control content display section (44a1 to 44b2, 54a to 55f) which is adapted to display, for the selected manually operated device, control content assigned to the operation switch (6, 7) of the manual operation means (5/25), the control device is adapted to receive, from the operation assistance terminal, via the communication means, a control target device switching signal identifying the control target device selected by an operation on the manually operated device selection section (44a, 44b) and is adapted to connect a control unit of the selected control target device and the operation switch (6, 7) of the manual operation means (5/25), and the control unit of the selected control target device is adapted to send a control signal according to said control content to the selected control target device when the operation switch of the manual operation means is operated by an operator. wherein the manual operation means (5/25) includes an operation switch (6, 7) adapted to control the individual control target devices included in the mechanical equipment (1/13), and a mechanical equipment identification signal transmission unit (11/26) adapted to transmit, to the operation assistance terminal, a mechanical equipment identification signal for identifying the mechanical equipment (1/13) including the manual operation means (5/25), the control device of the mechanical equipment (1/13) includes control units for individually controlling the control target devices, the operation assistance terminal comprises a screen adapted to display a manual operation assistance screen (44, 48) based on the mechanical equipment identification signal received from the mechanical equipment identification signal transmission unit (11/26), the manual operation assistance screen (44,48) including a manually operated device selection section (44a, 44b) adapted to select a manually operated device from the plurality of control target devices included in the mechanical equipment (1/13), and a control content display section (44a1 to 44b2, 54a to 55f) which is adapted to display, for the selected manually operated device, control content assigned to the operation switch (6, 7) of the manual operation means (5/25), the control device is adapted to receive, from the operation assistance terminal, via the communication means, a control target device switching signal identifying the control target device selected by an operation on the manually operated device selection section (44a, 44b) and is adapted to connect a control unit of the selected control target device and the operation switch (6, 7) of the manual operation means (5/25), and the control unit of the selected control target device is adapted to send a control signal according to said control content to the selected control target device when the operation switch of the manual operation means is operated by an operator.