Communication device, communication system, and communication method

A communication device comprising:

• a first communication circuit configured to receive, from, notification signals including user terminal identification information and a transmission request to provide transmission data including biomedical information re of a user;
• a second communication circuit configured to receive the transmission data, a size of the transmission data being larger than a size of data of the notification signals;
• and
• a controller configured to:
• receive a first notification signal from a first user terminal using the first communication circuit;
• determine to receive the transmission data from the first user terminal when the transmission request information in the first notification signal represents that biomedical information to be transmitted of a user of the first user terminal is recorded in the first user terminal;
• and
• execute, in parallel, a first process of receiving a second notification signal from a second user terminal by controlling the first communication circuit and a second process of receiving the transmission data from the first user terminal by controlling the second communication circuit.