A data-transmitting method of a handheld electronic device includes: detecting movement of a first handheld electronic device to generate a first motion data; receiving a broadcast signal, wherein the broadcast signal carries a source device data and a second motion data; comparing the first motion data with the second motion data; establishing a communication link to a second handheld electronic device according to the source device data when the first motion data matches the second motion data; and receiving a specific data from the second handheld electronic device or sending the specific data to the second handheld electronic device.