1. A communication device comprising:a communication interface configured to establish a connection to either a first device or a second device; and
a processor configured to control the communication interface,
wherein the processor is configured to send a predetermined notice to the second device before disconnecting the connection with the second device in a predetermined operation mode to switch the connection from the second device to the first device, but the processor is configured to not make the predetermined notice in other cases,
wherein the second device is configured to change connection setting information used for the connection with the communication device when a predetermined condition is satisfied while the connection with the communication device is disconnected, and
wherein the predetermined notice causes the second device to not change the connection setting information irrespective of the predetermined condition.