Time synchronization in network

The invention relates to a method for time synchronization in a network. The first host sends first synchronization information with a first timestamp to the slave to perform time synchronization on the first clock, and the slave compares the first timestamp with a first current time of the first clock, determines a clock frequency of the first clock and a time difference between the first clock and the first host based on the comparison, and performs time calibration, and enabling the first clock in the slave to run at the synchronized time. And the second host sends second synchronization information to the slave so as to perform time synchronization on the second clock. The clock frequency of the first clock is used to specify a clock frequency for the second clock, i.e., the clock frequency of the second clock is set to the clock frequency of the first clock. The slave compares a second timestamp of the second synchronization information with a second current time of the second clock and determines a time