The present invention provides an analyzing system with which a serial analysis inclusive of a pretreatment can be easily performed in a liquid chromatograph, and even unskilled users can perform a desired analysis. The analyzing system according to the present invention includes: an edit screen display section 31 for displaying an edit screen for allowing a user to create a pretreatment program using an external variable; a batch table display section 32 for displaying a batch table used for serially executing a plurality of analyses, the batch table having an external-variable setting field for allowing the user to enter the aforementioned external variable; and a serial analysis execution section 33 for serially executing each of the analyses inclusive of a pretreatment operation of an auto-sampler according to the pretreatment program and the batch table.