Portable device, communication system, communication connection method, and computer-readable recording medium

A communication connection method executed by a portable device, the method comprising:

• connecting communicatively with an external communication device by using any one of a plurality of communication channels through which notification of a network identifier has been given;
• determining, out of the plurality of communication channels, a communication channel not used by other devices, or a communication channel used by a relatively small number of devices in comparison with other communication channels, as a communication channel in a preferable communication state;
• switching a communication mode of the portable device between:
• a stable communication mode for establishing communication connection with the communication device by using a communication channel in the preferable communication state in the plurality of communication channels in accordance with a determination result obtained by the determining;
• and a connection priority communication mode for establishing communication connection with the communication device by using a predetermined communication channel in the plurality of communication channels without determination by the determining;
• and
• starting communication connection with the communication device.

A non-transitory computer-readable recording medium containing an executable program, the program instructing a processor of a portable device carried by a user to execute:

• connecting communicatively with an external communication device by using any one of a plurality of communication channels through which notification of a network identifier has been given;
• determining, out of the plurality of communication channels, a communication channel not used by other devices, or a communication channel used by a relatively small number of devices in comparison with other communication channels, as a communication channel in a preferable communication state;
• switching a communication mode of the portable device between:
• a stable communication mode for establishing communication connection with the communication device by using a communication channel in the preferable communication state in the plurality of communication channels in accordance with a determination result obtained by the determining;
• and a connection priority communication mode for establishing communication connection with the communication device by using a predetermined communication channel in the plurality of communication channels without determination by the determining;
• and
• starting communication connection with the communication device.