To store the occasional paces of each person as accompanying output signals as useful as possible at any time and to call them simultaneously with walking.

In view of making one cycle movement with the left foot and right foot, a digital signal of one cycle with the left foot and right foot outputted from a detector during walking is inputted to a microcomputer at any time and added, and the time width of the added one cycle is divided by 2 and stored to obtain the average time of one step. This value is stored at any time and called simultaneously with walking to function as an accompanying apparatus.