Abstract: A server and method for providing a learner-customized learning service are provided, whereby a correct answer rate is checked based on a real-time solving process and/or solving time for answering a question provided to a learner terminal such as a fixed terminal such as a computer or a portable terminal such as a smartphone. A difficulty level of the questions addressed to the learner terminal is adjusted and the questions are provided according to the correct answer rate. Therefore, learning materials are managed and provided to the learner terminal according to the learner terminal's ability.

Abstract: A server and method for managing learning is provided. A correct answer ratio is checked based on a real-time solving process and solving time of a question provided to a learner by using a terminal such as a computer or a portable terminal such as a smartphone to induce the learner to sincerely learn.

Abstract: A method and apparatus for providing knowledge information is provided. The method includes: receiving a search word from a first user terminal; and extracting knowledge information corresponding to the search word according to difficulty levels from a database (DB); and providing the extracted knowledge information to the first user terminal.

Abstract: A method of inducing a learner to log into a learning content-providing server, which is performed by a learner terminal, the method including: receiving an input of uniform resource locator (URL) information that is printed in a textbook; accessing a location in the learning content-providing server, which corresponds to the URL information; receiving and playing a learning content file, which is stored in the location in the learning content-providing server; and if a period or number of times the received learning content file is played expires, frequently accessing the learning content-providing server and requesting to extend the period or number of times the learning content file is played.