above process to select a hop sequence fig4 shows the information interaction flow of the present embodiment in which wlan sends the currently used channel number and other channel information to bluetooth in response to the request from bluetooth after establishing connection or after changing the used channel in the third embodiment of the present invention the multi mode communication device supports three communication modes of gsm gprs wlan and bluetooth which are all scheduled and managed by cpu in this embodiment the priority allocation for the three modes depends on the convenience and the frequency domain characteristic in realizing frequency hopping although gsm gprs has the function of frequency hopping the control over the channel for gsm gprs is not convenient when performed from inside the multi mode communication device since such channel is to be realized by the part of air link therefore gsm gprs usually used a fixed channel and is allocated with the highest priority in addition the priority to wlan is also higher than bluetooth since gsm gprs operates in a different frequency domain from that of wlan and bluetooth the correspondence between channels for wlan and bluetooth and the bandwidth thereof should be stored in the multi mode communication.