A computer program product for a wireless LAN system is configured such that connection settings necessary for a first communication terminal to connect with a wireless access point are made in accordance with an instruction from a second communication terminal, the second communication terminal being capable of performing data communication with the first communication terminal, the computer program product comprising computer readable instructions that cause a computer to function as the second communication terminal, the instructions defining procedures of determining, with performing data communication with the first communication terminal, whether the first communication terminal is capable of realizing a predetermined process regarding the connection settings by itself, and instructing the first communication terminal by sending the instruction for the connection settings to the first communication terminal in accordance with a result of determination made by the determining procedure.