Provided is a log analysis system including: an identifying unit that identifies transactions from logs output from a device; a grouping unit that categorizes the transactions having both the same log related to start and the same log related to end into the same group; a learning unit that creates a learning model that defines the number of occurrences on a log type basis in the transactions of the same group; and an inspection unit that inspects a transaction of an inspection target based on the learning model.