a display processor configured to create an electropherogram based on the acquired data and display the electropherogram on a screen of a display section;

an analysis range specifier configured to receive, on the electropherogram displayed on the display section, a specification, by a user, of a smear range to be extracted as an analysis target, and display a background area corresponding to the specified smear range on the electropherogram, in a visual mode that makes the background area distinguishable from other background areas; and

an analysis processor configured to perform a predetermined smear analysis using data included in the specified smear area,

wherein the analysis range specifier is configured to display, on the same screen as the electropherogram, an input area which allows numerical input of each of a beginning position and an ending position of the smear range to be analyzed, and to interlock an operation for an instruction concerning the smear range on the electropherogram and an operation for the numerical input in the input area with each other.