A communication method executed by a user equipment configured to communicate with a network of a mobile communication system includes the steps of: performing slice-based control of at least one of slice-based cell reselection that determines a frequency priority in consideration of a network slice or slice-based random access that selects a random access channel (RACH) configuration in consideration of the network slice; storing log information indicating a result of access to a network based on the slice-based control; and transmitting the log information to the network after connection to the network.