| 摘要 |
PROBLEM TO BE SOLVED: To avoid an incoming call by an IP telephone to a communication terminal where an IP telephone is an unusable state. SOLUTION: An communication terminal 10 has a resource state monitoring portion 13 monitoring a state of a resource (microphone, recorder, video camera, or the like) used by an IP telephone functional portion 12, a presence information generating portion 14 generating presence information based on a monitoring result of the resource state by the resource state monitoring portion 13, a presence information transmitting/receiving portion 15 transmitting the presence information generated by the presence information generating portion 14 to a presence server 40 and receiving the presence information of a communication terminal 20 from the presence server 40, and a presence information display portion 16 displaying the presence information of the communication terminal 20 received by the presence information transmitting/receiving portion 15. COPYRIGHT: (C)2006,JPO&NCIPI
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