| 摘要 |
A burden on a user is reduced as much as possible in updating presence, and the presence is automatically updated. Near-field communication is performed with a non-contact communication apparatus installed in each place by means of the low-power-output transmission/receiving section of a mobile phone to acquire, from the non-contact communication apparatus, information about the place where it is installed. The mobile phone compares presence information registered with a presence management table and the received installation place information, generates presence information based on presence information corresponding to the installation place information, and transmits the presence information with the use of a transmission/receiving section.
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