According to an embodiment of the present invention, a system access method for a user equipment performing machine-to-machine (M2M) communication with a system may include: awaiting, when the user equipment detects a need for system access, reception of access delay information from a base station for a preset delay information wait time; obtaining, when access delay information is received from the base station within the delay information wait time, an access delay time from the access delay information; and awaiting expiration of the access delay time while not attempting system access. Hence, system access attempts made by many M2M user equipments can be efficiently handled in the present invention.