Communication apparatus, communication system, and power control method

A communication system comprising:

• a first communication apparatus including:
• a first RF tag which performs communication using electromagnetic waves in a first frequency band,
• a second RF tag which performs communication using electromagnetic waves in a second frequency band different from those in the first frequency band,
• a storage unit having a shared area accessible from the first and second RF tags, and
• a power controller which generates power for driving the first RF tag and the storage unit using the first frequency band electromagnetic waves and supplies the generated power to the first RF tag and the storage unit, and which generates power for driving the second RF tag and the storage unit using the second frequency band electromagnetic waves and supplies the generated power to the second RF tag and the storage unit;
• and
• a second communication apparatus including:
• a first communication section which transmits to the first communication apparatus the first frequency band electromagnetic waves containing information for processing to be performed by the first RF tag, and
• a second communication section which transmits to the first communication apparatus the second frequency band electromagnetic waves containing information for processing to be performed by the second RF tag.