1. An image compression device using a prediction coding method, the image compression device comprising: plural types of predictors; plural types of quantizers; a global evaluation unit to perform a prediction for one line in an image to be compressed by using each of a plurality of the same types of predictors as the plural types of predictors, and to determine one quantizer out of the plural types of quantizers based on a prediction error amount of a predictor having a smallest prediction error; a local evaluation unit to perform a prediction for a prescribed pixel block in the one line by using each of a plurality of the same types of predictors as the plural types of predictors, and to identify one predictor out of the plural types of predictors based on a type of a predictor having a smallest prediction error; and a compression unit to compress data of the prescribed pixel block by using the predictor identified by the local evaluation unit and the quantizer determined by the global evaluation unit.