Communication device, communication control method, and communication system

A communication control method, by a first communication device, comprising:

• performing communication with a second communication device by a communication unit of the first communication device through any one communication channel of a plurality of communication channels;
• ascertaining communication delay time in the communication with the second communication device, with an echo request command, by a first communication time ascertaining unit of the first communication device;
• determining whether a communication state is satisfactory in the communication with the second communication device, by a communication state determining unit of the first communication device, based on the communication delay time ascertained by the first communication time ascertaining unit;
• and
• switching a communication channel used for the communication with the second communication device, from the one communication channel to another communication channel, by a communication switching unit of the first communication device, when the communication state determining unit determines that the communication state is unsatisfactory in the communication with the second communication device.

A communication system comprising:

• a first communication device;
• and
• a second communication device,
• wherein the first communication device includes:
• a communication unit configured to perform communication with the second communication device through any one communication channel of a plurality of communication channels;
• a first communication time ascertaining unit configured to ascertain communication delay time in the communication with the second communication device, with an echo request command;
• a communication state determining unit configured to determine whether a communication state is satisfactory in the communication with the second communication device, based on the communication delay time ascertained by the first communication time ascertaining unit;
• and
• a communication switching unit configured to switch a communication channel used for the communication with the second communication device, from the one communication channel to another communication channel when the communication state determining unit determines that the communication state is unsatisfactory in the communication with the second communication device.