This invention has as its object to set a one-to-one relationship upon setting a communication parameter for wireless communication between a wireless communication device on the information transmitting side and a wireless communication device that receives and processes the information and to terminate the processing as an error in an environment including a plurality of wireless communication devices. To this end, when the user inputs a wireless communication channel establishment instruction to both a digital camera and printer having wireless communication functions, these devices execute communication parameter setting processes within an allowable time period. When one of the devices detects a plurality of other devices within that time period, the communication parameter setting process is terminated as an error.