Patent ID: 8867434

Claim:
A network terminal, comprising: communication section that communicates with other network terminals connected via a network; time-series data creation section that, at timing set beforehand, creates time information including a correspondence between an identification number of the own network terminal and a current time measured by a timer of the own network terminal and creates time-series data registering the time information; additional registration section that, when the communication section receives time-series data transmitted from another network terminal, creates time information including a correspondence between the identification number of the own network terminal and a current time measured by the timer of the own network terminal and additionally registers the time information to time-series data received this time; transfer destination decision section that decides a network terminal as a transfer destination for each of time-series data created by the time-series data creation section and time-series data to which the additional registration section additionally registers time information; transfer section that, every time the transfer destination decision section decides a transfer destination of the time-series data, makes the communication section transfer the time-series data; determination section that determines nines that time-series data to which the time information is additionally registered by the additional registration section satisfies a time-setting condition when the number of network terminals registering the time information a plurality of times exceeds a threshold number of network terminals set beforehand; and time-setting section that, when the determination section determines that the time-setting condition is satisfied, performs time-setting by correcting a time measured by the timer of the own network terminal on a basis of time information registered in the time-series data.