Communication device, program, and communication establishment method

A communication establishment method for a subject communication device to communicate with different communication devices, comprising;

• in a connection establishment process, establishing a wireless connection with the different communication devices;
• in a device detection process, detecting that the different communication devices enter into a communication area;
• and
• in a communication determination process, determining whether or not the wireless connection with a first communication device, which is one of the different communication devices, has not been established at a time when it is detected in the device detection process that a second communication device, which is another one of the different communication devices, enters into the communication area, or whether or not a communication of a predetermined content is being performed with the first communication device establishing the established wireless communication at the time when it is detected in the device detection process that the second communication device enters into the communication area, wherein:
• the wireless connection with the detected second communication device is preferentially established in the connection establishment process when it is determined in the communication determination process that the wireless connection with the first communication device has not been established or the communication of the predetermined content is not being performed with the first communication device at the time when it is detected in the device detection process that the second communication device enters into the communication area.