Connection method and communication device for electronic system

The invention provides a connection method for an electronic system. The electronic system comprises a plurality of communication devices, each communication device can create multiple wireless connection modes with another communication device, and the method comprises the steps that: when a first communication device is indicated to transmit a datum to be transmitted to a second communication device, the first communication device judges at least one data property of the datum to be transmitted and at least one connection property of the second communication device to the multiple wireless connection modes; and the first communication device selects a wireless connection mode from the multiple wireless connection modes according to the at least one data property of the datum to be transmitted and the at least one connection property of the second communication device to the multiple wireless connection modes.