Contents distribution system, node device, leaving process delay method, and computer-readable recording medium in which leaving process delay control program is recorded

A contents distribution system in which contents are transmitted and received among a plurality of node devices, the contents distribution system comprises a plurality of the node devices which can be communicated to each other through a network, comprising:

• a receiving device configured to receive instructions of leaving from a leaving node device which leaves the contents distribution system,
• an obtaining device configured to obtain transmission ability information concerning a transmission ability of the leaving node device from the receiving device which has received the instructions of leaving,
• a determining device configured to determine a delay time in such a way that the higher the transmission ability is, the longer the delay time for use in delaying the leaving from the contents distribution system is, based on the transmission ability obtained by the obtaining device, and
• a leaving device configured to perform a leaving process from the contents distribution system when the determined delay time has elapsed after the receipt of the instructions of leaving by the receiving device.

A method of leaving a node device in a contents distribution system in which contents are transmitted and received among a plurality of node devices, the contents distribution system comprises a plurality of the node devices which can be communicated to each other through a network, the method including steps, the steps comprising:

• receiving instructions of leaving from a leaving node device which leaves the contents distribution system,
• obtaining transmission ability information concerning a transmission ability of the leaving node device which has received the instructions of leaving in the receiving process,
• determining a delay time in such a way that the higher the transmission ability is, the longer the delay time for use in delaying the leaving from the contents distribution system is, based on the transmission ability information obtained in the obtaining process, and
• performing a leaving process from the contents distribution system when the determined delay time has elapsed after the receipt of the instructions of leaving in the receiving device.

A computer-readable recording medium recording a node processing program to be performed, in a contents distribution system in which contents are transmitted and received among a plurality of node devices, the contents distribution system comprises a plurality of the node devices which can be communicated to each other through a network, the node processing program comprising steps of:

• receiving instructions of leaving from a leaving node device which leaves the contents distribution system,
• obtaining transmission ability information concerning a transmission ability of the leaving node device which has received the instructions of leaving in the receiving process,
• determining a delay time in such a way that the higher the transmission ability is, the longer the delay time for use in delaying the leaving from the contents distribution system is, based on the transmission ability information obtained in the obtaining process, and
• performing a leaving process from the contents distribution system when the determined delay time has elapsed after the receipt of the instructions of leaving in the receiving device.