To obtain a characteristic one part and not the whole of an electronic toy device and to make performable other operation thereby, by providing a toy body outputting detection information of circumferential environment with an operation means operating its one part or the whole and controlling the operation of a controller mountable to the toy body based on the detection information.

A controller 50 is installed in the toy body 1, and when only the power switch of the toy body 1 is turned on, legs are operated for a prescribed time. Then, when the power of a power supply device is inputted, CPU reads out a basic program from ROM, sequently reads out and executes a program for setting the operation from ROM of the tool body, and displays a screen for setting operation on a display part. The operation of an operation part 57 can set the operation of the toy body 1 corresponding to various types of sensor inputs. Other types of operations can be made by purchasing only a toy body 1. The toy body 1 only is purchased and also served as the controller 50 so that the cost can be reduced.