PURPOSE: To facilitate the change of a product number, and reduce the cost by arranging a light shielding sensor to take out an electric wire having a connector and a terminal, a display means of a shape of a connector to be used and a terminal inserting position and a control means.

CONSTITUTION: A kind of connector 2 to be used is beforehand inputted in use order to a memory 12, and simultaneously when the shape is flickered on a display unit 10 by starting, a display lamp 4 of a connector box 3 having it is also flickered. When the connector is taken out, a light shielding sensor 5 is turned on, and the display unit 10 also changes to lighting. Next, when an electric wire 7 having a terminal is taken from an electric wire support tool 6, a stepping sensor 8 is turned on, and a terminal inserting position is flickered on the display unit 10, and a terminal housing chamber 21 in which a terminal 27 is inserted is indicated. When the terminal 27 is all inserted in the connector, an alarm is given by a buzzer 26 and an alarming lamp 28, and a connector assembly is returened to the support tool 6, and the sensor 8 is turned on. When the whole is finished, the buzzer 26 buzzes long, and at the same time, a guiding device 1 is reset.