© 2003 SICE. We analyzed the Co-emergence process on the cooperative walks between two humans. As the results, we found the cyclic process based on the following two control processes. One is the process to realize the footsteps' coherence between the cooperative walkers. The other is the process to control the footsteps' coherence by the mutual relations with the fluctuations of the arms' swing, connected with the attention. Additionally we found that the arms' fluctuations take flexible synchronizations between the cooperative walkers. These results suggest that the synchronization of the cyclic process realize the Co-emergence of the cooperative walk flexibly.