1. A license verification method, the method comprising: determining whether a type of a verification target is a binary file type; if the type of the verification target is a binary file type, obtaining a binary file and extracting a character string to be searched for from the obtained binary file; determining whether the type of the verification target corresponds to a kernel module; if the type of the verification target corresponds to the kernel module, obtaining the kernel module and extracting a character string to be searched for from the obtained kernel module separately; and comparing the extracted character string from the obtained binary file and the obtained kernel module against a database created according to a license to be verified.